Move CopyMetadata to Init in MP4FileStream

Fixes a crash when closing the MP4FileStream before actually
writing/receiving any packets
Fix typo in Replay Buffer
Disable FastAlloc for 64 bit builds

FastAlloc only uses the lower 32 bits of a pointer to index its internal
structures which is a problem for allocations with size >= 0x8001,
because multiple big allocations can have the same values for bit 16 to
bit 32, which causes FastAlloc to discard its info about the previous
allocation
Release packets earlier in the ReplayBuffer

With very high bitrate settings the replay buffer would severely violate
the memory usage estimate because it wouldn't release any frames until
it was done writing the file, which could take a long time depending
on the storage subsystem
Workaround github API issue
Added "Import" button in Global Sources Dialog.

The "Import" button opens a "Open" dialog where a user can open a scene collection file then it lists all Global Sources from the selected scene collection in a dialog.

You can Import multiple global sources by holding shift or Ctrl and clicking on the Global sources you want to import.

With this change scene collections have their own Global Sources but users can import Global Sources from other scene collections.

If you make any changes to a Global sources properties and want the change in another scene collection you will need to remove the global source in the other scene collection and then import it again.

You can't import Global Sources if there is already a Global Source with the same name.

Hopefully this makes it simple and fast for users to import their commonly used Global sources like for
example followers alerts.
Use absolute paths for opening files where possible

Works around various 3rd party nasties that change the working directory and don't set it back properly.
Log message when using a non-default IP binding
Fix Broadcast Settings mode switching for rtl locales
Add StringList::Join utility
Refactor status bar output status handling
Separate Replay Buffer from normal file recording
Add date/time replacement for save path

Also OBS will now automatically create directories when needed
Add separate setting for Replay Buffer File Path
Add Record from Replay Buffer

This basically saves the current replay buffer and continues recording
to the saved file. The recording uses the standard file path.
Share memory between ReplayBuffer and RecordingHelper
Throttle RecordingHelper::AddPacket to keep buffer from filling RAM

For each incoming video packet two more video packets should be written
by the save thread to make sure that the buffer drains
Improve RecordingHelper::SaveThread shutdown behaviour

This gives unfinished recordings a bit more time to write the remaining
buffered packets before threads are (potentially) terminated
Update version to 0.63 test 3
Merge pull request #362 from Glought/SceneCollectionGlobalSourcesImport

Added "Import" button in Global Sources Dialog.