Don't force the app to maximize the window on startup

[karniv00l]

Is your feature request related to a problem? Please describe.

Don't force the app to maximize the window on startup. Some of us have bigger resolutions/higher pixel density on desktops.

Describe the solution you'd like

Use some sensible defaults and store the last window state/dimensions as a user preference

[KRTirtho]

Done implementing. I had no idea that WidgetsBindingObserver.didChangeMetrics exists. It was the key to solve the problem

[karniv00l]

Works great now, thanks!