StreamUP Scene as Transition v1.3.1

Combined update covering v1.3.0 and v1.3.1. Last public release was v1.2.1, so if you haven't updated in a while, this is a big stability pass.

Fixes in v1.3.1

• Filter to Trigger is properly fixed - It was caching the filter reference at load time and never refreshing, so it would go stale after OBS updates or if you rearranged filters. It now looks up the filter fresh every time a transition starts. No more dead triggers.
• Old plugin detection got smarter - It used to only check the current module folder. Now it searches ProgramData and AppData too, and the cleanup dialog gives you a one-click rename to `.old` instead of just pointing you at a folder.
• Qt 6.10 build fix - for Debian Sid and anyone building out of tree. Closes #16.

Fixes in v1.3.0

• No more lockup when no scene is selected - Transitions were freezing OBS if you hadn't set a scene, blocking scene and transition changes until restart.
• Filter triggers at 0% now - Was being ignored if you set the transition point all the way to the start.
• First scene change after launch works - Filter wasn't triggering and audio could behave oddly on the very first switch. Sorted.
• Ref count leak fixed - when the plugin was destroyed or settings changed mid-transition.
• Cleaner cleanup - Centralised the transition stop logic so it's consistent whether you're destroying, updating, or finishing a render.

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Cheers.

• Added automatic detection of old scene-as-transition.dll file
• Displays warning popup with option to open plugins folder and highlight old file for removal
• Updated plugin log name to "StreamUP Scene as Transition"
• Improved compatibility checks to prevent conflicts with legacy versions

• Fixed cases where the transition filter failed to load by adding lazy-loading and null-safety guards
• Updated to work with OBS 32

• Fixed bug when audio not outputting after OBS is started

• Added Volume control over transition scene.
• Added audio fade control for scene A & scene B
• Added various locales:
  • Danish [Credit: jegadk]
  • Dutch [Credit: Silverlink & WaldoAndFriends]
  • German [Credit: Lercer]
  • Japanese [Credit: Youji]
• Fixed a few locale references

• Added transition scene audio to final audio mix.
• Added localisation for others to translate.
• Added Spanish locale file. [Credit: COOLIGUAY]
• Fixed Media Sources cutting off at transition point.

• Fixed the 'Filter To Trigger' option resetting to the default when the properties is opened.
• Fixed the 'Preview Transition' only working one time unless you change a setting or reopen the properties.