Add screenshots of launchers

add XMCL (X Minecraft Launcher)

remove MMC CF pack file import support

Curseforge App works on linux, modrinth currently does not

ATLauncher can now directly download FTB modpacks.

add GDLauncher Carbon column, update old GDL

FTB App now supports custom instances

Vanilla launcher has instance support

Update pojavlauncher section.

add distributions row (packages)