Theme (#664)

* Initial theme manager, not yet done

* Added rich_theme_manager

* Updated rich-theme-manager

* Switched to rich_theme_manager for theme management

* Updated dependencies

* Added rich paging to subtopic help

* Fixed clone to clone only styles specified in cloned theme

* Added placeholder for help colors

* Updated config dir, help methods

osxphotos/cli/cli.py

@@ -24,6 +24,7 @@ from .places import places
 from .query import query
 from .repl import repl
 from .snap_diff import diff, snap
+from .theme import theme
 from .tutorial import tutorial
 from .uuid import uuid
 
@@ -77,6 +78,7 @@ for command in [
     repl,
     run,
     snap,
+    theme,
     tutorial,
     uninstall,
     uuid,