feat!: drop modules, general refactor and cleanup

runtime/queries/gn/folds.scm

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+[
+  (list)
+  (block)
+  (if_statement)
+  (else_statement)
+] @fold

runtime/queries/gn/highlights.scm

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+; Includes
+"import" @keyword.import
+
+; Conditionals
+[
+  "if"
+  "else"
+] @keyword.conditional
+
+; Repeats
+"foreach" @keyword.repeat
+
+; Operators
+[
+  "="
+  "+="
+  "-="
+  "!"
+  "+"
+  "-"
+  "<"
+  "<="
+  ">"
+  ">="
+  "=="
+  "!="
+  "&&"
+  "||"
+] @operator
+
+; Variables
+(identifier) @variable
+
+; Functions
+(call_expression
+  function: (identifier) @function.call)
+
+; Fields
+(scope_access
+  field: (identifier) @variable.member)
+
+; Literals
+(string) @string
+
+(escape_sequence) @string.escape
+
+(expansion) @none
+
+(integer) @number
+
+(hex) @string.special
+
+(boolean) @boolean
+
+; Punctuation
+[
+  "{"
+  "}"
+  "["
+  "]"
+  "("
+  ")"
+] @punctuation.bracket
+
+[
+  "."
+  ","
+] @punctuation.delimiter
+
+(expansion
+  [
+    "$"
+    "${"
+    "}"
+  ] @punctuation.special)
+
+; Comments
+(comment) @comment

runtime/queries/gn/indents.scm

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+[
+  (block)
+  (parenthesized_expression)
+] @indent.begin
+
+[
+  "}"
+  ")"
+  "]"
+] @indent.end @indent.branch
+
+(comment) @indent.auto

runtime/queries/gn/injections.scm

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+((comment) @injection.content
+  (#set! injection.language "comment"))

runtime/queries/gn/locals.scm

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+[
+  (source_file)
+  (block)
+] @local.scope
+
+(identifier) @local.reference