The LLApp API used to consist of init(), mainLoop(), cleanup() methods. This
makes sense -- but on Mac that structure was being subverted. The method
called mainLoop() was in fact being called once per frame. There was
initialization code in the method, which (on Mac) needed to be skipped with an
already-initialized bool. There was a 'while' loop which (on Mac) needed to be
turned into an 'if' instead so the method would return after every frame.

Rename LLApp::mainLoop() to frame(). Propagate through subclasses LLAppViewer
and LLCrashLogger. Document the fact that frame() returns true to mean "done."
(This was always the case, but had to be inferred from the code.)

Rename the Mac Objective-C function mainLoop to oneFrame. Rename the C++ free
function it calls from runMainLoop() to pumpMainLoop(). Add comments to
llappdelegate-objc.mm explaining (inferred) control flow.

Change the Linux viewer main() and the Windows viewer WINMAIN() from a single
LLAppViewer::mainLoop() call to repeatedly call frame() until it returns true.

Move initialization code from the top of LLAppViewer::frame() to the init()
method, where it more properly belongs. Remove corresponding
mMainLoopInitialized flag (and all references) from LLAppViewer.

Remove 'while (! LLApp::isExiting())' (or on Mac, 'if (! LLApp::isExiting())')
from LLAppViewer::frame() -- thus unindenting the whole body of the 'while'
and causing many lines of apparent change. (Apologies to reviewers.)

There are four LLApp states: APP_STATUS_RUNNING, APP_STATUS_QUITTING,
APP_STATUS_STOPPED and APP_STATUS_ERROR. Change LLAppViewer::frame() return
value from (isExiting()) (QUITTING or ERROR) to (! isRunning()). I do not know
under what circumstances the state might transition to STOPPED during a
frame() call, but I'm quite sure that if it does, we don't want to call
frame() again. We only want a subsequent call if the state is RUNNING.

Also rename mainLoop() method in LLCrashLogger subclasses
LLCrashLoggerWindows, LLCrashLoggerMac, LLCrashLoggerLinux. Of course it's
completely up to the frame() method whether to yield control; none of those in
fact do. Honor protocol by returning true (frame() is done), even though each
one's main() caller ignores the return value.

In fact LLCrashLoggerWindows::mainLoop() wasn't using the return protocol
correctly anyway, returning wParam or 0 or 1 -- possibly because the return
protocol was never explicitly documented. It should always return true: "I'm
done, don't call me again."

MAINT-6392: Do not change the URL used for getting cookies (except to pass it to CEF) The original URL is used for HTTP Core access to profile functionality.

Make more settings between mac and windows the same
Remove solaris and xp featuretables, since we don't support them any more

MAINT-6336: Put the timeout upstream of the suspending pump and fire the timeout it. Also some cleanup on LLSD construction in vivox.

MAINT-6338: Add methods for getting and setting boolean properties from gSavedSettings in the HTTPCore. Use those methods to access new key HTTPLogBodyOnError. Dump body of HTTP message to log in case of error if this key is true.

MAINT-6336: Centralize waiting on event pump with a timeout. Shorten the lifespan of a timeout event pump lifespan to be no longer than necessary. Change all references to the LLEventTimer to instead uses the centralized version.

Fix further merge error in LLLiveLSLEditor::draw()

MAINT-6326 [QuickGraphics-RC] Blingposter avatars are all full bright white when basic shaders are disabled.

MAINT-6317 [QuickGraphics-RC] Some rigged mesh attachments render fully on jellybaby avatars when ALM is enabled