rework project structure for more logical filenames and code separation

mcg.py

@@ -0,0 +1,23 @@
+#!/usr/bin/env python3
+
+"""MPDCoverGrid is a client for the Music Player Daemon, focused on albums instead of single tracks."""
+
+
+import os
+import sys
+
+from mcg.application import Application
+
+
+
+
+if __name__ == "__main__":
+    # Set environment
+    srcdir = os.path.abspath(os.path.dirname(__file__))
+    if not os.environ.get('GSETTINGS_SCHEMA_DIR'):
+        os.environ['GSETTINGS_SCHEMA_DIR'] = os.path.join(srcdir, 'data')
+
+    # Start application
+    app = Application()
+    exit_status = app.run(sys.argv)
+    sys.exit(exit_status)