Use ForgeFlower

[jamierocks]

1. Cleanup existing patches
2. Start using ForgeFlower

[caseif]

The primary blocker to this at the moment is ForgeFlower's use of gitpatcher. Gradle forbids the same plugin to be used twice within a project, so we'd need to figure out how to convince it to build it as a subproject while still applying patches to both projects.

[jamierocks]

Possible solution to to have a repo with Forge's changes applied that we can reference rather than the actual repo.