feat!: drop modules, general refactor and cleanup

runtime/queries/gdscript/folds.scm

@@ -0,0 +1,26 @@
+[
+  ; Body fold will "join" the next adjacent fold into a SUPER fold.
+  ; This is an issue with the grammar.
+  ; (body)
+  (if_statement)
+  (elif_clause)
+  (else_clause)
+  (for_statement)
+  (while_statement)
+  (class_definition)
+  (enum_definition)
+  (match_statement)
+  (pattern_section)
+  (function_definition)
+  (lambda)
+  (constructor_definition)
+] @fold
+
+; It's nice to be able to fold the if/elif/else clauses and the entire
+; if_statement.
+(if_statement
+  (body) @fold)
+
+; Fold strings that are probably doc strings.
+(expression_statement
+  (string) @fold)