Integrates support for Feral Gamemode, discrete GPU support for Mesa and the proprietary Nvidia driver and MangoHud support
Signed-off-by: Jan200101 <sentrycraft123@gmail.com>
Keep track of compatible Java versions from meta. Launch-step
VerifyJavaInstall will check if current instance's Java version is
compatible.
Also add override option both globally and per-instance in-case the user
doesn't care about the requirement.
