Development Environment improvements

[Zedb0T]

1. Set a Environment Variable JAK_ISO_DATA_DIR that points to ISO_DATA somewhere outside of the repo, so when you clone any mod base mod it can instantly find iso_data without you needing to copy/move/duplicate anything

2. If you try to compile and game is not extracted, automatically extract game, and then proceed with the compile without failing.

3. If you try to boot-game and game is not compiled, automatically attempt to compile the game, and then boot.

8mb.video-X5P-lOHWSSmN.mp4

[Zedb0T]

It checks the original path/proj-path for iso stuff first, before falling back to this env variable.