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-c.json

@@ -1,9 +1,9 @@
 {
   "url": "https://github.com/tree-sitter/tree-sitter-c",
-  "rev": "fa408bc9e77f4b770bd1db984ca00c901ddf95fc",
-  "date": "2021-02-24T11:13:22-08:00",
-  "path": "/nix/store/8rlr93kjsvbpc8vgfxw02vcaprlfmprq-tree-sitter-c",
-  "sha256": "03nb8nlnkfw8p8bi4grfyh31l6419sk7ak2hnkpnnjs0y0gqb7jm",
+  "rev": "5aa0bbbfc41868a3727b7a89a90e9f52e0964b2b",
+  "date": "2021-03-03T17:00:36-08:00",
+  "path": "/nix/store/2wa64ii39p31wpngvqk4ni8z8ws29r2g-tree-sitter-c",
+  "sha256": "1diys8yigvhm4ppbmp3a473yxjg2d5lk11y0ay7qprcz7233lakv",
   "fetchSubmodules": false,
   "deepClone": false,
   "leaveDotGit": false