Improve style editor

[andy840119]

This is now style looks like.
Should be moved into Edit/Style namespace.
.
Also should made a new design.
Should have style like exist translator/layout editor
.
This issue can be separated into several PRs :

• Implement initial screen.
• Implement left side config.
• Implement right side preview.
• Implement edit note style.
• Implement manage list of style.
  • This about how to list all of them.
  • Also should mark this style have how many lyric use(?).
• Make all the feature wotks.

[andy840119]

Might have looks like that.
.
Can be separated into section :

• Color (Adjust place and render type)
• Font (Adjust place and size)
• Shadow

[andy840119]

Got a idea
Maybe just throw playfield into here?
And should able to close playfield.