chore(TTk): mouseTrack=True by default

[slook]

• Changed: It is no longer necessary to specify the mouseTrack=True argument when initializing a TTk() root instance.

perhaps mouseTrack could be True by default in TTk core?

yes, it make sense.

[ceccopierangiolieugenio]

I need to keep this on hold for the time being.
The mousetrack is kind of a heavy operation in the terminal, it constantly stream ansi commands back and forth causing a massive flow of widget updates, at the moment I prefer to keep it disabled by default, it is ok to have it enabled in the demo or in the tools that may benefit from this.
I need to investigate the drawbacks, speed and footprint of this feature.
Unfortunately I am not receiving enough feedbacks to make a proper decision.