TabBar Colors

• issue-860: Updated TabBar color states and added an independent line color state.

Sample:

tabBar.setLineColor(Color.orange.base, for: .selected)
        
tabBar.setTabItemsColor(Color.grey.base, for: .normal)
tabBar.setTabItemsColor(Color.purple.base, for: .selected)
tabBar.setTabItemsColor(Color.green.base, for: .highlighted)