auto plugins wip
mostly completed natures, integrated into project loading

TODO:

 * generate resource files for binary AutoPlugins and AutoImports
 * translate error messages from logic system into natures system
 * cycle checks in logic system
 * check deprecations/binary compatibility
 * unit tests for logic system
 * user documentation
 * break into logical commits
 * (optional) 'about plugins' or similar to show more information about the auto-plugins for a project
 * (deferred) allow AutoPlugin to inject Commands directly?
 * (deferred) provide AutoPlugin functionality to arbitrary scopes instead of just at the Project level?