SPC m g C is only used in Clojure whereas SPC m g c is used in various layers.
This is simpler to just move create tags to SPC m g C and move the clojure
bindings to SPC m g c (since it is not used in the clojure layer).
- Add option to disable by default
- Use local-vars hook to allow per-project enable/disable
- Don’t enable helm-gtags-mode (no need)
- Move emacs bindings from helm-gtags-mode-map to ggtags-mode-map