Added a "Piano Display COS version" Color of Sound

[War3Evo]

I did not wish to "add buttons" to this version, unless you know a way to "hide" buttons from display for jsfx, in order to add this feature. So I created another plugin with the changes. "piano-display-color-of-sound.jsfx"

I added a new function to piano-ui.jsfx-inc called "piano_keyed_name_letter_only" for the use for this plugin.

I wanted it to be based on The Color of Sound Chart by https://www.flutopedia.com/sound_color.htm