Project renaming and reorganization

ClojureFX -> cljfx-arg
Further renaming and reorganization
Cosmetic changes; Discovered more about ClojureFX

- Added tests to experimental.clj
- Made section breaks more visible in core.clj
Removed test comment from bottom
More testing

- mod!
- render!
render!, mod!, def-render!, etc.
render! -> add!; more testing
Added resources (fonts, etc.)
Synced from original ClojureFX branch.