Work around iTunes 12.9 being completely broken with NVDA

[LeonarddeR]

Link to issue number:

Fixes #8744

Summary of the issue:

For many people, iTunes is an essential piece of software to control their Apple devices. iTunes 12.9 switched to UIA for many controls, including the foreground window. The current appModule isn't expecting UIA and therefore not UIA proof, making iTunes completely unusable.

Description of how this pull request fixes the issue:

This patch adds a check to the choose overlay classes method to return early for UIA objects.

Testing performed:

Did some basic tasks in iTunes, all seemed to work in an acceptable fashion.

Known issues with pull request:

• The volume slider values seem to be multiplied by 100, so 100% is reported as 10000. This is really a bug in iTunes.
• I consider this a temporary work around. Since it is a fix with minimum amounts of code and maximum improvement for the end user, I propose adding this to NVDA 2018.3 as an emergency fix.

Change log entry:

• Bug Fixes
  • NVDA will no longer make iTunes 12.9 and newer completely unusable to interact with. (NVDA doesn't read anything on iTunes #8744)