[NEW-FEATURE] Visual composer - improvements

[kuh0005]

[ ] - Transparency of Background Color, for inserted object (white/dark mode)
[ ] - Background Color of inserted object managed from one place
[ ] - Save/store extended option settings (for inserting object) on client side, and load them when any composer is opened
[ ] - Add an option in the extended settings to sort objects alphanumerically by symbol
[ ] - inserting multiple image into one view (with option as a objects)
[ ] - Vertical dimension is not changed correctly when hiding side panel