Add Options, Functions and Settings to convert Node-Names and Strings to kebab-case

- refactored and renamed String::_camelcase_to_underscore to String:_separate_compound_words
- refactored String::to_snake_case to work with the refactored String::_separate_compound_words
- created char_utils::is_hyphen to catch all hyphen variants in kebab-case conversion
- created String::to_kebab_case using the new String::_separate_compound_words
- created corresponding Documentation in String and StringName
- simplified both switch statements in EditorNode and ProjectDialog
- added new kebab-casing Option for Node Names in ProjectSettings
- added missing camelCase Options to Scene- and Node-Names in ProjectSettings
- simplified Mono RuntimeInterop Functions
- hooked up the ConnectionsDialog
- created additional Unit Tests

core/object/script_language.h

@@ -246,6 +246,7 @@ public:
 		SCRIPT_NAME_CASING_PASCAL_CASE,
 		SCRIPT_NAME_CASING_SNAKE_CASE,
 		SCRIPT_NAME_CASING_KEBAB_CASE,
+		SCRIPT_NAME_CASING_CAMEL_CASE,
 	};
 
 	struct ScriptTemplate {