Add admin capcodes

Sometimes, it is necessary for an admin or other moderator to reveal
themselves. Capcodes allow them to do so by appending a special colored
portion at the end of their name on a post.

This adds object-level permissions, so if you have a moderator who
shouldn't be able to use the "admin" capcode, you can give them
permission only to the "moderator" capcode.

Signed-off-by: Alek Ratzloff <alekratz@gmail.com>

board/admin.py

@@ -1,15 +1,10 @@
 from django.contrib import admin
 from django.urls import reverse
 from django.utils.safestring import mark_safe
-from board.models import (
-    Ban,
-    BanTemplate,
-    Board,
-    Post,
-    RangeBan,
-    ReportReason,
-    ReportRecord,
-)
+
+from guardian.admin import GuardedModelAdmin
+
+from board.models import *
 
 #
 # Admin sites
@@ -82,3 +77,8 @@ class BanAdmin(admin.ModelAdmin):
 @admin.register(BanTemplate)
 class BanTemplateAdmin(admin.ModelAdmin):
     ordering = ("board__url", "name")
+
+
+@admin.register(Capcode)
+class CapcodeAdmin(GuardedModelAdmin):
+    pass