Allow lang without quotes and lang="typescript"

<script lang=ts> and <style lang=sass> without quotes weren't
recognized, so they used the first syntax in the config. For sass, it
also flattened the nesting when indenting. lang="typescript" wasn't
recognized either.

Languages not in the config still use the first syntax as before.

README.md

@@ -132,7 +132,8 @@ let g:vim_vue_plugin_config.foldexpr = 0
 
 Note
 
-- `typescript` matches `lang="ts"`
+- `typescript` matches `lang="ts"` and `lang="typescript"`
+- `lang` can be in double or single quotes, or without quotes
 - `list` options can be `string` if only one
 - The first item of syntax list will be used if no "lang=..."
 - For `.wpy`, `initial_indent` defaults to `['script', 'style']`