Added LLNotificationsListener to hook LLNotifications to the event system according to https://wiki.lindenlab.com/wiki/Incremental_Viewer_Automation/Event_API
reviewed by palmer.

Oops, forgot to update the plugin loading code when I switched ll_plugin_start to take LLSD arguments.

Add LLViewerWindowListener per Incremental_Viewer_Automation/Event_API.
Add LLViewerWindowListener pointer to LLViewerWindow, and initialize in ctor.
Add llviewerwindowlistener.{h,cpp} to newview/CMakeLists.txt.

llwindow refactoring in skinning-7 r117641 added dependency on
LLWindowCallbacks in llwindowheadless, which was not being built
for server only builds.

* Include llwindowcallbacks.cpp in all llwindow builds.
* Do not link with libatk and libsdl for server linux builds, since
  they are not needed and only packaged for the viewer.

Reviewed with James.

Moved LLAPRSockStream out of llcommon into eventhost module so I can reenable its tests in the new world order.

new --nonotifications command line option for automated testing

Reviewed by Q

DEV-34488 Can not save script to a prim.  Underlying issue was LLPreview holding two member variables mObjectUUID and mObjectID.  mObjectID was null for scripts.  It appears to be used only for notecards (?), so I converted it to mNotecardObjectID and switched references to point to mObjectUUID.  Renamed one other variable to mSaveObjectID for clarity.  Removed unnecessary include files and de-inlined a couple functions because I was there.  Reviewed with Steve.

merge -r125267:125272 svn+ssh://svn.lindenlab.com/svn/linden/branches/avatar-pipeline/inventory-links__merge__viewer2.0.0-3-r125202 to svn+ssh://svn.lindenlab.com/svn/linden/branches/viewer/viewer-2.0.0-3

methods. Introduce LLAppViewerListener based on LLDispatchListener,
instantiate a static one in llappviewer.cpp. Initial implementation only
supports ["op"] == "requestQuit".