improves performance and makes the code cleaner
* add parameters instead of calling methods afterwards
* remove a a lot of size requests
* remove parameters that are being set to the default value
* simplify dialogs containers
this removes create_panel function from panels and mandates a class name Panel
remove panel_type param and only use a panel_name that is it's filename
remove load_panel dict
always reinit panel, (simpler and safer but slower)
