ดาวน์โหลด VapourSynth R75

- slightly improved memory usage when many frames are queued for output
- improved things for distro packagers
- improved ccfEnableFrameRefDebug flag, it now outputs a list of all allocated frames as a log message after every external frame request has been completed
- fixed config issues on fedora and alpine linux and probably their closest friends too
- plugins can now ship with multiple copies targeting different optimization levels on x64 and have the best one automatically loaded
- simple plugin manifests have been implemented that stops further recursive plugin loading and enables loading of plugins compiled with optimized settings
- multiple improvements to the portable version experience where vsrepo is now installed by default again and forwarding bat files are provided to closer match pre R74 paths