Ensure ROMs are decompressed before loading them into a media group (#321)

All compressed archives (zip, rar, and 7z) are decompressed when a media group is created.

Only files with an extension defined in the platform mapping are added to the M3U file.

Closes #307

gaseous-server/wwwroot/pages/emulator.html

@@ -23,6 +23,8 @@
     var emuBios = '';
     var emuBackground = '';
 
+    console.log("Loading rom url: " + decodeURIComponent(getQueryString('rompath', 'string')));
+
     ajaxCall('/api/v1.1/Games/' + gameId, 'GET', function (result) {
         gameData = result;