Toggle Checkboxes & Design refresh

Changelog

• Added: Checkbox toggles, thanks @chrisbennet
• Changed: Lighter Page List without lines and light edit-icons, larger font-size
• Changed: Tabs: Lighter color with shaddow
• Changed: Labels; removed bold font-weight of inputfield-labels
• Changed: Labels; hover colors of inputfield-labels
• Changed: Page-title: decreased font-size
• Upated: Latest AdminThemeUikit dependencies
• Fixed: Various small issues; dropdowns, buttons etc.
• Fixed: Dark black is now darker ;)
• Fixed: AdminHelpTab color