modifications

* rowH set to 24px;
* add "List font size" property, easier to change list row font size.
* group artist font size set to 24pt.
* group album font size set to 16
* group album font color set to gcolor_2
* albumH set to 24
* artistH set to 32
theme modification

* replace artX, artY with cGroup.cover.x, cGroup.cover.y
* add album art on left style
* remove redundant codes
theme and menu modifications

* album title and album artist align on left
* many menu grayed out when cover do not show
* button color fix