Changed icon size to small when opening the gallery field sidebar

Signed-off-by: Elliot Condon <e@elliotcondon.com>
Changed icons to dark

Signed-off-by: Elliot Condon <e@elliotcondon.com>
Minor gallery field CSS tweak

Signed-off-by: Elliot Condon <e@elliotcondon.com>
Fixed incorrect class

https://github.com/AdvancedCustomFields/acf5-beta/issues/150
Signed-off-by: Elliot Condon <e@elliotcondon.com>
Many visual tweaks and improvements including new dark icons

Signed-off-by: Elliot Condon <e@elliotcondon.com>