Added the  sample music player to the editors code

Added the  sample music player to the editors code,  now the users can
listen to music while editing with out any other program opened.
some minor changes
Merge branch 'master' of https://github.com/MarianoGnu/EasyRPG-Editor

Conflicts:
	EasyRPG-Editor.pro
Fix build issue. Solve a MetaObject warning