feat!: align standard captures with upstream

Problem: Sharing highlight queries with upstream tree-sitter and
Helix is difficult.

Solution: Where reasonable, use capture names in tree-sitter's standard
list or Helix's Atom-style hierarchy.

Specifically:

* tree-sitter "standard capture names"
  (3f44b89685/highlight/src/lib.rs (L20-L72)):

  - `@parameter` -> `@variable.parameter`
  - `@field` -> `@variable.member`
  - `@namespace` -> `@module`
  - `@float` -> `@number.float`
  - `@symbol` -> `@string.special.symbol`
  - `@string.regex` -> `@string.regexp`
  - `@text.*` -> `@markup.*` (`strong`, `italic`, `link`, `strikethrough`; with exceptions; see below)
  - `@text.title` -> `@markup.heading`
  - `@text.literal` -> `@markup.raw`
  - `@text.reference` -> `@markup.link`
  - `@text.uri` -> `@markup.link.url` (in markup links)
  - `@string.special` -> `@markup.link.label` (non-url links)
  - `@punctuation.special` -> `@markup.list` (markdown lists only; move subitems from `@text.todo`)

* Helix captures
  (https://docs.helix-editor.com/master/themes.html#syntax-highlighting):

  - `@method` -> `@function.method`
  - `@method.call` -> `@function.method.call`
  - `@text.{todo,warning,note,danger}` -> `@comment.{error,warning,hint,info,todo}`
  - `@text.diff.{add,delete,}` -> `@diff.{plus,minus,delta}`
  - `@text.uri` -> `@string.special.url` (outside markup)
  - `@preproc` -> `@keyword.directive`
  - `@define` -> `@keyword.directive`(`.define`?)
  - `@storageclass` -> `@keyword.storage`
  - `@conditional` -> `@keyword.conditional`
  - `@debug` -> `@keyword.debug`
  - `@exception` -> `@keyword.exception`
  - `@include` -> `@keyword.import`
  - `@repeat` -> `@keyword.repeat`

* cleanup

  - remove some redundant `@conceal` (but still allow it for conceal-only patterns)
  - remove obsolete `@error` (syntax linting is out of scope for this repo)
  - sort, cleanup capture list in `CONTRIBUTING.md`

queries/kotlin/highlights.scm

@@ -97,10 +97,10 @@
 ))
 
 (package_header "package" @keyword
-	. (identifier (simple_identifier) @namespace))
+	. (identifier (simple_identifier) @module))
 
 (import_header
-	"import" @include)
+	"import" @keyword.import)
 
 ; The last `simple_identifier` in a `import_header` will always either be a function
 ; or a type. Classes can appear anywhere in the import path, unlike functions
@@ -142,16 +142,16 @@
 	("init") @constructor)
 
 (parameter
-	(simple_identifier) @parameter)
+	(simple_identifier) @variable.parameter)
 
 (parameter_with_optional_type
-	(simple_identifier) @parameter)
+	(simple_identifier) @variable.parameter)
 
 ; lambda parameters
 (lambda_literal
 	(lambda_parameters
 		(variable_declaration
-			(simple_identifier) @parameter)))
+			(simple_identifier) @variable.parameter)))
 
 ;;; Function calls
 
@@ -227,9 +227,9 @@
 ((multiline_comment) @comment.documentation
   (#lua-match? @comment.documentation "^/[*][*][^*].*[*]/$"))
 
-(shebang_line) @preproc
+(shebang_line) @keyword.directive
 
-(real_literal) @float
+(real_literal) @number.float
 [
 	(integer_literal)
 	(long_literal)
@@ -254,7 +254,7 @@
 ;    - "[abc]?".toRegex()
 (call_expression
 	(navigation_expression
-		((string_literal) @string.regex)
+		((string_literal) @string.regexp)
 		(navigation_suffix
 			((simple_identifier) @_function
 			(#eq? @_function "toRegex")))))
@@ -266,7 +266,7 @@
 	(call_suffix
 		(value_arguments
 			(value_argument
-				(string_literal) @string.regex))))
+				(string_literal) @string.regexp))))
 
 ;    - Regex.fromLiteral("[abc]?")
 (call_expression
@@ -279,7 +279,7 @@
 	(call_suffix
 		(value_arguments
 			(value_argument
-				(string_literal) @string.regex))))
+				(string_literal) @string.regexp))))
 
 ;;; Keywords
 
@@ -323,7 +323,7 @@
 	"if"
 	"else"
 	"when"
-] @conditional
+] @keyword.conditional
 
 [
 	"for"
@@ -333,14 +333,14 @@
 	"continue@"
 	"break"
 	"break@"
-] @repeat
+] @keyword.repeat
 
 [
 	"try"
 	"catch"
 	"throw"
 	"finally"
-] @exception
+] @keyword.exception
 
 
 (annotation