Load missing plugins on file open

PlayWall/assets/de/tobias/playpad/assets/lang/_de.properties

PlayWall/src/de/tobias/playpad/Strings.java

...ll/src/de/tobias/playpad/viewcontroller/LaunchDialog.java

...src/de/tobias/playpad/viewcontroller/cell/PluginCell.java

...s/playpad/viewcontroller/dialog/PluginViewController.java

...lCore/src/de/tobias/playpad/plugin/PluginDescription.java

PlayWallCore/src/de/tobias/playpad/plugin/Plugins.java