Piano Keyboard widget

[minyor]

Hello. I decided to add a piano keyboard widget in PianoBooster.
Yes, I know, that many people are not liking this idea, some do.. I did that for fun.
I'm using it in learning process and it is quite useful for me, so far.

I failed to compile current v0.7.0-alpha, so I forked repo from v0.6.8 tag.
Here are Github and binary links:
Github repository
Binary Win32 release

Here is how it looks:

[romul]

Done: https://github.com/captnfab/PianoBooster/issues/38