Add SFTweaks, a companion mod to help with pack support and bugfixes

[Dutchs]

This PR relies on: https://www.curseforge.com/minecraft/mc-mods/sftweaks
Main additions, so far:

A config for tracking modpack version:

.\config\SFTweaks.cfg which in turn is used to log the version in a couple of places:

• latest.log during boot:
• in crashlogs
• $modpack_version$ will be replaced in the motd/server name in server.properties

Bugfixes:

• Stop MobSpawners from dropping exp orbs when broken.

Some changes to AccessibilityOnboardingScreen

After clicking Continue

Fixes #37

[Dutchs]

This mod will allow me to add specific pack fixes in the future where the only choice we have is a mod/mixin.
I also plan on enforcing or warning the player when they try to join a server with a different pack version, but that part of the mod was not completely implemented yet.