Add syntax highlighting

plugin/tagbar.vim

@@ -181,6 +181,13 @@ function! s:OpenWindow()
     setlocal foldcolumn=1
     setlocal foldtext=v:folddashes.getline(v:foldstart)
 
+    syntax match Comment    '^" .*'              " Comments
+    syntax match Identifier '^[^: ]\+$'          " Non-scoped kinds
+    syntax match Title      '[^:(* ]\+\ze\*\? :' " Scope names
+    syntax match Type       ': \zs.*'            " Scope types
+    syntax match SpecialKey '(.*)'               " Signatures
+    syntax match NonText    '\*\ze :'            " Pseudo-tag identifiers
+
     let cpoptions_save = &cpoptions
     set cpoptions&vim