tree-sitter: 1.18.2 -> 0.19.3

Update the grammars and add `allGrammars` derivation.
`nix-build "<nixpkgs>" -A tree-sitter.allGrammars` will create a
derivation with symlinks to all the grammars

pkgs/development/tools/parsing/tree-sitter/grammars/tree-sitter-regex.json

@@ -1,9 +1,9 @@
 {
   "url": "https://github.com/tree-sitter/tree-sitter-regex",
-  "rev": "be2e415b5716615530234d179dc27c32b7a1d86b",
-  "date": "2020-05-14T15:05:54-07:00",
-  "path": "/nix/store/acbcq9lgh5pf6hq3329fa253yfvaj6ji-tree-sitter-regex",
-  "sha256": "0qxbafbwfj64bwhj3455jgkidpdzqwrlsqm3rckq2pi75flnkv42",
+  "rev": "3041aa3472d16fd94c6a9e15b741dbfecd9b714e",
+  "date": "2021-03-04T14:37:27-08:00",
+  "path": "/nix/store/7d200fzyx2rkbbgf47g5ismvd4id0fqy-tree-sitter-regex",
+  "sha256": "0jah3apalvp7966sjzdrka2n7f83h64sd56nbq2lzmrxgv98rxmg",
   "fetchSubmodules": false,
   "deepClone": false,
   "leaveDotGit": false