WinForms: Tweak suspend/resume to only apply to containers and fix a few bugs mainly when using a scrollable where resume wouldn't happen in the right order
WinForms: When ComboBox is set to use a background color, show the background color on the combo box itself, not on the items in the drop down list
WinForms: Fix tabbing through controls within a scrollable
WinForms: Adjust initial size of ColorPicker