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-html.json

@@ -1,9 +1,9 @@
 {
   "url": "https://github.com/tree-sitter/tree-sitter-html",
-  "rev": "7f442e1c6163d450c69c75c7a621badc3a0ea98f",
-  "date": "2020-07-20T12:46:52-07:00",
-  "path": "/nix/store/qklk97krsas1kjbh8dp6ii1gj9sqz8h9-tree-sitter-html",
-  "sha256": "0z249nnxlal8g6zbrys6kb80vksgcw2j5nd737m6yna2h5bhl126",
+  "rev": "d93af487cc75120c89257195e6be46c999c6ba18",
+  "date": "2021-03-04T14:11:18-08:00",
+  "path": "/nix/store/26yjfh6v17n4ajs9ln7x25sf1m3ijcjg-tree-sitter-html",
+  "sha256": "1hg7vbcy7bir6b8x11v0a4x0glvqnsqc3i2ixiarbxmycbgl3axy",
   "fetchSubmodules": false,
   "deepClone": false,
   "leaveDotGit": false