add tree-sitter-regex (#1362)

* add tree-sitter-regex

* adapt regex highlights from upstream

* inject regex into elixir sigil_r/2 and sigil_R/2

* generate lang-support docs

* capture interesting nodes in character-ranges

* make $.character_class captures more consistent

* fix fallthrough behavior for character classes

* capture pattern characters as 'string'

* use latest tree-sitter-regex

* set elixir regex injections as combined

* add link to upstream queries

* inject regex in rust into 'Regex::new' raw string literals

1 files changed, 0 insertions, 0 deletions

diff --git a/helix-syntax/languages/tree-sitter-regex b/helix-syntax/languages/tree-sitter-regex
new file mode 160000
+Subproject e1cfca3c79896ff79842f057ea13e529b66af63