Merge pull request #1 from Shiandow/master

Refactor boilerplate.
Merge pull request #2 from Shiandow/master

Do not match case for shotrcutDisplayString
Added more example PlayerExtensions:
HelloWorld
KeyRemap
Playlist
Fixed playlist extension relying on external resource file which isn't supported by MPDN.
Changed add/remove shortcut keys to Ins and Del.
Moved openFileDialog.Filter string out of designer to prevent it from using resource.