feat(config): add matchers for removing titlebars

This commit adds a new field to the static config file, "remove_titlebar_applications", which allows
users to now use the full range of matching strategies to identify applications for which titlebars
should be removed. This is heavily discouraged for a number of reasons, and is unlikely to work with
a wide range of applications which now draw their own titlebar regions. The previous advice to use
in-application configuration settings to hide title bars if they exist is still valid.

resolve #805

schema.bar.json

@@ -1122,6 +1122,11 @@
         }
       ]
     },
+    "icon_scale": {
+      "description": "Scale of the icons relative to the font_size [[1.0-2.0]]. (default: 1.4)",
+      "type": "number",
+      "format": "float"
+    },
     "left_widgets": {
       "description": "Left side widgets (ordered left-to-right)",
       "type": "array",