Media Playlist Source 0.1.0

Starting from this version (0.1.0), the minimum requirement is OBS 31, and I am glad to announce that PR #11126 is merged already since OBS 31, which means you do not need to install my custom builds of OBS anymore.

## What's Changed
* Fix issue where the last file isn't played when OBS is restarted
* Adjust for OBS 31 changes
* Fix issue where the current_file_name setting is not updated when the next media is played (Thanks @nstwfdev for reporting)

P.S. I wanted to add some more features for this release but it took me a long time to debug them, so for now I'm just releasing an OBS 31 compatible version, which I should've done long ago. Sorry for the wait!

• Add "Close File when Inactive" option. Note that the plugin already only loads one file at a time; this option makes it so it doesn't keep holding the CURRENT file when it is not playing.
• Add speed option upon request of @ne0lines (on discord). Note that changing the speed WILL cause the media source to restart, as the media source in OBS restarts when you change speed. To ensure smooth scrolling on the speed option, the plugin no longer refreshes the Properties when a setting is changed. Consequently, I have added a dedicated button to refresh the "Current Filename" in the Properties.

Fix crash with empty or shuffled folder

Thanks to @KronosRazer on OBS Discord server for finding this crash and testing the update!

Fixed hotkeys and playback behavior

• Fixed hotkey names not appearing properly
• Fixed next and previous hotkeys not working
• Fixed play/pause not working
• Fixed continuous playback not working after stopping the video and restarting, or after stopping and playing a selected file, or after clearing all files and adding new ones
• Play first file when the last file in the list is played

The minimum OBS version is raised to 30.0.0. You can download the corresponding custom build here https://github.com/CodeYan01/obs-studio/releases/tag/30.0.0.8051