Allows the ability to add a new scene collection via the frontend API.
Blocks until the scene collection has been successfully added to ensure
synchronization between the calling thread and the UI thread.
(Jim: Added detailed description to commit message)
Closesobsproject/obs-studio#1232
Due to the commit 34c14829b6, source loading is now deferred
to after OBSInit(), which would cause saved scene/source projectors to
no longer load on startup. This fixes that issue by moving the
OpenSavedProjectors call to OBSBasic::Load().
This code was originally tested with visual C, which supports using
__FUNCTION__ in this way. These potential error cases shouldn't
technically happen anyway, so just remove __FUNCTION__.
OBS assumes the name of the imported json file is also the name
of the scene collection, if the filename is different this can result
in duplicate scene collections after importing.
Closesjp9000/obs-studio#1177
When running the program for the first time, no scene collections will
show up in the scene collection menu. This changes it to forcibly save
the first scene collection on the first run of the program, and then
re-enumerates the list to ensure it's listed.
This commit fixes a bug that would cause the frontend API function
obs_frontend_set_current_scene_collection to never be successful. Due
to the bug, the following null pointer check would always fail, so the
action would never be triggered.
Modification by Jim: Instead of fixing the typo that caused this to
occur, make it so both scene collection menus and profile menus both use
"file_name" consistently.
Closesjp9000/obs-studio#712
