Add g:tagbar_scopestrs (#661)

Allows mapping scope suffixes (e.g. 'function') to user-defined values.

doc/tagbar.txt

@@ -733,6 +733,38 @@ just choose other characters in that case):
         let g:tagbar_iconchars = ['▸', '▾']
         let g:tagbar_iconchars = ['▷', '◢']
         let g:tagbar_iconchars = ['+', '-']  (default on Windows)
+<
+                                                          *g:tagbar_scopestrs*
+g:tagbar_scopestrs~
+Default: {}
+
+Setting to replace a tag's scope with a user-specified string in Tagbar's
+display. If a scope is found in the keys of |g:tagbar_scopestrs|, then the
+scope will be displayed as the corresponding value.  If the scope is not
+found, then the scope will be displayed as normal.
+
+Example (don't worry if some of the characters aren't displayed correctly,
+just choose other characters or strings in that case):
+>
+        let g:tagbar_scopestrs = {
+            \    'class': "\uf0e8",
+            \    'const': "\uf8ff",
+            \    'constant': "\uf8ff",
+            \    'enum': "\uf702",
+            \    'field': "\uf30b",
+            \    'func': "\uf794",
+            \    'function': "\uf794",
+            \    'getter': "\ufab6",
+            \    'implementation': "\uf776",
+            \    'interface': "\uf7fe",
+            \    'map': "\ufb44",
+            \    'member': "\uf02b",
+            \    'method': "\uf6a6",
+            \    'setter': "\uf7a9",
+            \    'variable': "\uf71b",
+            \ }
+
+
 <
 
                                                         *g:tagbar_autoshowtag*