v3.0.0

• New structure to create different palettes #268, #164
• New light palette #240, #268
• Improved dark palette #252, #266, #264, #265, #248
• Improved tool buttons #260
• Improved tabs #270, #271, #267
• Improved combo boxes #263
• Improved close/float sizes os-dependent #267
• Fix checkbox problems #200, #259, #239
• Fix indicators' colors in menus and tables #242
• Fix dock widget tab hover #243
• Workaround for menus with indicators and icons #214
• Update to be compatible with Qt 5.[12,13,14,15]