ดาวน์โหลด VapourSynth R76

- vsrepo is now no longer installed automatically for portable installs due to most plugins being available on pypi
- the register-install command can now be used on *nix as well (HolyWu)
- fixed ctrl-c handling in vspipe on non-windows systems
- fixed an issue where certain compilers would occasionally compile the avx2 code path for some internal filters like maximum in a way that could produce pixels garbage along the edges
- once again uses XDG_CONFIG_HOME environment variable for config location, was accidentally forgotten in r74
- fixed issue where caches could be forgotten with frames still in them and leak memory
- completely reworked cache limits so they are much stricter and the number of threads will now be dynamically lowered to avoid using too much memory