Add support for DPI Scaling (HiDPI or DPI Awareness)

[ManiacDC]

When the system DPI is changed, TypingAid doesn't work well. The height and width of the ListBox are not computed correct. On Windows Vista and higher, the listbox displays in the wrong position for apps that don't support DPI awareness.

[ManiacDC]

fbb9c0c

I added "-DPIScale" to the ListBox, allowing it to return the proper width and height. The Character Width issue was fixed as part of:
5376c6a

In Windows 8.1 I can detect that an application is not DPI aware, but in prior versions I cannot. I'm going to add an override option to the preferences.

[ManiacDC]

Added an override option in the preferences for prior versions of Windows.
0f8bd9e

Note that this has not been tested in 8.1+ to verify that the DPI scaling is detected properly.