Add some small utility functions

[stdedos]

I know it's not the scope of your tool, but it'd be nice if AppView had a .name.

It is not complicated either:

   ...: from win32gui import GetWindowText
   
In [2]:print(GetWindowText(get_apps_by_z_order()[0]))
IPython: E:pyvda/pyvda

... or you can choose to do some comtypes etc.

It would facilitate e.g. on the #44 debug