Some pending messages might try to update non-existing view or cause a pop up, neither should be avaliable by this point, so just don't process them

SL-15867 User not logged in - very much the MVS (minimum viable solution) but by storing the OpenID cookie when it arrives then injecting it forcefully into each new media instance, it appears that the 'not logged in' problem is solved - at least in my testing, 20+ times logging in without a cache and profiles, dashboard etc. were all logged in - QA will confirm. The full solution involves providing a separate cache for each media instance and tightening up the CEF cookie calling code - that is a large project and this is sufficient for now

SL-15867 User not logged in - very much the MVS (minimum viable solution) but by storing the OpenID cookie when it arrives then injecting it forcefully into each new media instance, it appears that the 'not logged in' problem is solved - at least in my testing, 20+ times logging in without a cache and profiles, dashboard etc. were all logged in - QA will confirm. The full solution involves providing a separate cache for each media instance and tightening up the CEF cookie calling code - that is a large project and this is sufficient for now

DRTVWR-534: Batch of modifications to 360 capture project after moving from internal repo to public one.

This reverts commit 681298dd, reversing
changes made to 323f41f4.

Don't block main thread if possible

Two sleep() methods: one accepting F32Milliseconds, or in general any LLUnits
time class; the other accepting any std::chrono::duration.

The significant thing about each of these sleep() methods, as opposed to any
freestanding sleep() function, is that it only sleeps until the app starts
shutdown. Moreover, it returns true if it slept for the whole specified
duration, false if it woke for app shutdown.

This is accomplished by making LLApp::sStatus be an LLScalarCond<EAppStatus>
instead of a plain EAppStatus enum, and by making setStatus() call set_all()
each time the value changes. Then each new sleep() method can call
wait_for_unequal(duration, APP_STATUS_RUNNING).

Introducing llcond.h into llapp.h triggered an #include circularity because
llthread.h #included llapp.h even though it didn't reference anything from it.
Removed. This, in turn, necessitated adding #include "llapp.h" to several .cpp
files that reference LLApp but had been depending on other header files to
drag in llapp.h.

requestExit() doesn't close CEF, command sets CEF into closing state which will be processed on update()

LLThread::currentID() used to return a U32, a distinct unsigned value
incremented by explicitly constructing LLThread or by calling LLThread::
registerThreadID() early in a thread launched by other means. The latter
imposed an unobvious requirement on new code based on std::thread. Using
std::thread::id instead delegates to the compiler/library the problem of
distinguishing threads launched by any means.

Change lots of explicit U32 declarations. Introduce LLThread::id_t typedef to
avoid having to run around fixing uses again if we later revisit this decision.

LLMutex, which stores an LLThread::id_t, wants a distinguished value meaning
NO_THREAD, and had an enum with that name. But as std::thread::id promises
that the default-constructed value is distinct from every valid value,
NO_THREAD becomes unnecessary and goes away.

Because LLMutex now stores LLThread::id_t instead of U32, make llmutex.h
#include "llthread.h" instead of the other way around. This makes LLMutex an
incomplete type within llthread.h, so move LLThread::lockData() and
unlockData() to the .cpp file. Similarly, remove llrefcount.h's #include
"llmutex.h" to break circularity; instead forward-declare LLMutex.

It turns out that a number of source files assumed that #include "llthread.h"
would get the definition for LLMutex. Sprinkle #include "llmutex.h" as needed.

In the SAFE_SSL code in llcorehttp/httpcommon.cpp, there's an ssl_thread_id()
callback that returns an unsigned long to the SSL library. When LLThread::
currentID() was U32, we could simply return that. But std::thread::id is very
deliberately opaque, and can't be reinterpret_cast to unsigned long.
Fortunately it can be hashed because std::hash is specialized with that type.

Brought back the changes from @andreyk for improved mouse scroll wheel performance (previously 8e228364f324)

Pull in CEF 75.0.1+gb5e74dd+chromium-75.0.3770.80 and Dullahan 1.2.x along with some minor compatibility changes

Changes from @andreyk for improved mouse scroll wheel performance and pull in new Dullahan with CEF 74.1.19_gb62bacf_chromium-74.0.3729.157

SL-10811 - [Render][OSX] Google’s search results page is not fully displayed in the Media Browser if HiDPI is enabled.
SL-10813 - [Render][OSX] HiDPI browser has black bars on the sides.
Fixed.

MAINT-8325 Fixed The Save Local dialog disconnects the viewer if you do not choose the save directory files within the first minute

libatmosphere integrated in indra/llrender/llatmosphere.cpp

Still working on runtime shaders to use libatmosphere precomputed atmospherics textures

Fixes for: MAINT-8244 Text in CEF cannot be selected with the mouse. MAINT-8245 Expose CEF log file and logging severity to viewer and MAINT-8246 Expose the CEF remote debugging system to the viewer

Fixes for 'MAINT-8196 Remove LLPluginCookieStore from the viewer' and 'MAINT-8194 Remove per-frame calls to updateJavascriptObject()'

Pull in Dullahan 1.1.930 with improved fix for maint-8095 (target='_blank' links) as well as an improvement for maint-8100 (no error message for invalid hostname / url)