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/cmake/highlights.scm

@@ -21,7 +21,7 @@
 
 (normal_command (identifier) @function)
 
-["ENV" "CACHE"] @storageclass
+["ENV" "CACHE"] @keyword.storage
 ["$" "{" "}" "<" ">"] @punctuation.special
 ["(" ")"] @punctuation.bracket
 
@@ -37,18 +37,18 @@
  (elseif)
  (else)
  (endif)
-] @conditional
+] @keyword.conditional
 
 [
  (foreach)
  (endforeach)
  (while)
  (endwhile)
-] @repeat
+] @keyword.repeat
 
 (normal_command
-  (identifier) @repeat
-  (#match? @repeat "\\c^(continue|break)$")
+  (identifier) @keyword.repeat
+  (#match? @keyword.repeat "\\c^(continue|break)$")
 )
 (normal_command
   (identifier) @keyword.return
@@ -59,7 +59,7 @@
   (function)
   (argument_list
     . (argument) @function
-    (argument)* @parameter
+    (argument)* @variable.parameter
   )
 )
 
@@ -67,7 +67,7 @@
   (macro)
   (argument_list
     . (argument) @function.macro
-    (argument)* @parameter
+    (argument)* @variable.parameter
   )
 )
 
@@ -134,7 +134,7 @@
   (argument_list
     . (argument)
     (
-    (argument) @_cache @storageclass
+    (argument) @_cache @keyword.storage
     .
     (argument) @_type @type
     (#any-of? @_cache "CACHE")
@@ -148,8 +148,8 @@
   (#match? @_function "\\c^unset$")
   (argument_list
     . (argument)
-    (argument) @storageclass
-    (#any-of? @storageclass "CACHE" "PARENT_SCOPE")
+    (argument) @keyword.storage
+    (#any-of? @keyword.storage "CACHE" "PARENT_SCOPE")
   )
 )
 
@@ -213,5 +213,5 @@
 
 (escape_sequence) @string.escape
 
-((source_file . (line_comment) @preproc)
-  (#lua-match? @preproc "^#!/"))
+((source_file . (line_comment) @keyword.directive)
+  (#lua-match? @keyword.directive "^#!/"))