Separating client widget and shared stuff

Signed-off-by: Thomas Pasch <thomas.pasch@gmx.de>
Added client-to-server RPC for wiki-custom-widgets SimpleComponent

Signed-off-by: Thomas Pasch <thomas.pasch@gmx.de>
Added server-to-client RPC for wiki-custom-widgets SimpleComponent

Signed-off-by: Thomas Pasch <thomas.pasch@gmx.de>