+ selected Tab bar has now opaque background color
+ styles for buttons inside Task Panel that are in reality QToolButtons
+ styles for QListWidget and QTreeView items with checkboxes
+ simplified regular QCheckBox styling
+ simplified toolbar button separators
+ added hover and pressed states for toolbar buttons to improve user experience
+ partial fix for button with icons inside Task panel
+ fixed styles for fields inside a table cell
+ fixed background logo for Win and Linux
+ improved QToolBar handle for different icon sizes (selectable by user inside Preferences)
+ tweaked editable fields inside QToolBar in order to work for all icon sizes (selectable by user inside Preferences)
+ fixed Ubuntu problem that caused a blank line inside up/down buttons of QSpinBox and similar
+ tweaked Python Editor color for Light theme
+ fixed buttons margin/padding inside Task tab
+ tweaked color for checked QPushButtons inside Draft WB for better user experience