toggleSidebar item has not consistent naming

[chuckn0rris]

Forum post

see docs:
https://bryntum.com/products/calendar/docs/api/Calendar/view/Calendar#config-tbar

we have toggleSidebar name, but in the code we use toggleSideBar. SOo, docs or code should be fixed.

[ExtAnimal]

"Sidebar" is a noun and a class name, so the item name is incorrect and should be changed.

The docs use the correct name.

We can change the name in the configuration, but add

    changeTbar(tbar) {
        if (tbar.toggleSideBar) {
            tbar.toggleSidebar = tbar.toggleSideBar;
            delete tbar.toggleSideBar;
        }
        return super.changeTbar(...arguments);
    }

for backwards compatibility until 7.0