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

requirements.txt

@@ -20,7 +20,8 @@ pyobjc-framework-Quartz>=7.3,<9.0
 pyobjc-framework-Vision>=7.3,<9.0
 PyYAML>=5.4.1,<6.0.0
 rich>=11.2.0,<12.0.0
+rich_theme_manager>=0.7.0
 textx>=2.3.0,<2.4.0
 toml>=0.10.2,<0.11.0
 wrapt>=1.13.3,<1.14.0
-wurlitzer>=2.1.0,<2.2.0
+wurlitzer>=2.1.0,<2.2.0