Don't play nice, pay the price

Mixin fixes for mods I use in my pack, since sometimes they don't play nicely.

Current fixes include:

• Gadgets n' Goodies
  • Fixes Jetpack, game won't crash anymore
  • Removes "Hai 5" debug message on client console while flying
• Grim Pack
  • Make Grave more blast resistant, similar to OpenBlocks
• Minecraft Comes Alive
  • Remove update & supporter check
• SignPictures
  • Remove update check
• Secret Rooms (as of 1.1.0)
  • Remove update check

Also adds the following features:

• Config options for all mentioned fixes
• Config option to show count of active coremods on title screen
• Config option to hide all modded branding on title screen