Import button is restyled
Menu is implemented
More button restyle
"Show more ({0})" displaying
Icon is replaced by Unicode symbol
Updated symbol and colors
Removed ShowMoreTextConverter
Added margin for More button
FontSize reduced by 1
Merge pull request #233 from vmoyseenko/DUI-ImportBtnRestyle

"Import add-on" button restyle
Merge pull request #234 from vmoyseenko/DUI-MoreButton

StandardPanel's "More" button restyle