Misc. Changes

- Add prerequisites to README.md
- Downgrade gradle-wrapper.properties version from 1.12 to 1.11 until
  IntelliJ pushes a new stable release that works properly with it
- Switch gradle-wrapper.properties to use the 'all' zip instead of 'bin'
- Update MinecraftForge to 10.12.1.1065
- Grab protected fields from super when loading addons
- Mark CommonMessagePipeline as Sharable

Signed-off-by: Steven Downer <grinch@outlook.com>