Move Quasar config to Python

[rodja]

By making the Quasar config available through globals.quasar_config it can be configured/changed by the app. This can for example be used to disable the loading bar:

from nicegui import globals as nicegui_globals
...

nicegui_globals.quasar_config['loadingBar']['skipHijack'] = False

...

[falkoschindler]

@rodja How can I reproduce the loading bar? I'd like to check if setting quasar_config has indeed an effect.

[falkoschindler]

Ok, somehow the loading bar is gone. But changing the primary color using quasar_config works.