[UI] widgets background is done via ui, not setStyleSheet,
ImageViewer icons updated
[UI] polished ui, added about,quit,search icons
[OTHER] cleanup
[UI][CORE] edit album almost complete, just missing db update
[JS] global vars renamed
[OTHER] removed alert from js
[UI][CORE] disabled caching because of wrong images shown in webview after deletion
[UI][CORE][DB] albums are now updated in the database as well