Resources subdir without requiring user to explicitly set DYLD_LIBRARY_PATH.
Engage the SHARED_LIB_STAGING_DIR mechanism for Mac as well as Windows and
Linux so unit-test executables, too, can find libllcommon.dylib. Perform the
POST_BUILD copy of libllcommon.dylib to SHARED_LIB_STAGING_DIR everywhere but
Windows -- but make it conditional on SHARED_LIB_STAGING_DIR.

To be reviewed by Mani

self-identifies as @executable_path/../Resources/filename. This allows the SL
executable to find it at runtime in its official place in the app bundle.
Change viewer_manifest.py to copy libllcommon.dylib, libapr*.dylib to app
bundle's Resources subdir.

DEV-36893 make missing eventhost module a non-fatal error.  We now print a warning and fail gracefully.

Moves libllcommon.so to a staging dir for unit tests to work
and gets rid of LL_COMMON_API in forward declarations

this doesn't actually fix anything yet though.

Update Mac apr_suite package, introducing libapr-1.0.3.7.dylib and
libaprutil-1.0.3.8.dylib. We want to use dynamic APR libraries, but
libllcommon.dylib isn't allowed to depend on .so libraries: must be .dylibs
themselves.
Tweak APR.cmake to reference the aforementioned .dylibs when on Mac with
LLCOMMON_LINK_SHARED set. Eliminate some redundancy in Windows section.
For .dylibs, RunBuildTest.cmake must set DYLD_LIBRARY_PATH: LD_LIBRARY_PATH
only affects search for .so files.

PENDING:
CMake dependencies broken? With LLCOMMON_LINK_SHARED on, it seems we need to
build libllcommon.dylib explicitly before full build can succeed.
This snapshot does NOT yet copy the llcommon, apr or aprutil dylibs into the
app bundle.

DEV-35405 Added creation of <exe_dir>/components directory in debug builds to quell the savage llmozlib.

DEV-35405 Viewer manifest needed some love for supporting the debug build, but its still broke on llmozlib

Fixing up string escaping on calls to RunBuildTest.cmake
Also added ilasm.bat to the FindMono.cmake search

Now using RunBuildTest.cmake to run tut and lscript_lsl tests, inorder to set path to llcommon.dll
Exported a few llcommon apis needed by server components/tests.

New package of xmlrpc-epi that actually links to the expat libs we ship. I have no idea how this has worked for so long.

 - Added LLNotificationsInterface class.
 - Removed LLLoginInstance use of LLNotifications EventAPI

Cmake changes and fixes to python script to get it to work properly

Mani reviewed most of this

First draft of cleaning up eventhost module on viewer shutdown.  Still need to make the whole system more generalized and data driven.

Fix for crash when running windows debug build.  std::string::replace cannot take NULL for it's argument.

Switching eventlet to use subrepo.

By Brad, reviewed by Palmer

Merged in my latest changes including switching LLAPRSockStream to be fully non-blocking (and thus not horribly inefficient) and a bunch of new event listener implementations.