Fix floatcanvas Text.ShiftFunDict: convert float to int

[komoto48g]

Fixes #2748

This PR modifies "wx/lib/floatcanvas/FCObjects.py" and is part of #2448, which currently has conflicts.

[komoto48g]

Sorry, I hadn't checked the bitmap drawing test. I've confirmed that the bitmap position is also incorrect.
But I just pushed one more commit—could you revert or reopen this? Sorry for the inconvenience.

[swt2c]

Can't - you'll have to open a new PR.

[komoto48g]

Ok, I will!

[urishab]

I’m not sure this fix is gonna cut it.
The // operator no longer converts to int.
it just gives the floor of the number but can return float.
so I think you’re going to have to explicitly convert to int to satisfy all cases.

[komoto48g]

I can see that, but it doesn't cover all cases. I also tested the Allow and AllowLine cases and confirmed that they have issues as well. The issue comes from passing a float value to dc.DrawXXX.
I will check some more and submit a PR later and would appreciate it if you could review it.