Remove .pyc and .pyo files when updating

[LeonarddeR]

Link to issue number:

Fixes #9960

Summary of the issue:

When updating NVDA, old *.pyc and *.pyo files can stay around. This could be problematic for Python 2 pyc files that Python 3 tries to open. Furthermore, it could cause issues such as reported in #9960, where the logHandler gets really mad if it tries to log a traceback for a file in library.zip which is also available in the installation directory.

Description of how this pull request fixes the issue:

When removing old program files, check for *.pyc and *.pyo files and get rid of them/

Testing performed:

Placed a handyTech.pyc file in C:\Program Files (x86)\NVDA\brailleDisplayDrivers. Made sure it disappeared after installing the try build for this pr.

Known issues with pull request:

1. This removes *,pyc and *.pyo files from systemConfig as well, but I think that's fine.
2. This does not yet fix the issue where old braille display driver dll's stick around on the system, particularly handy tech, hims and alva.

Change log entry:

None needed

[feerrenrut]

Thanks @LeonarddeR

[DrSooom]

1. This removes *,pyc and *.pyo files from systemConfig as well, but I think that's fine.

Perhaps only as long as add-ons weren't copied to that configuration folder via the GUI. Does the logon screen started instance of NVDA have write permission for this folder, as pyc and pyo files are created from the py files on NVDA startup? If this is the case, then the Installer should recommend to restart the PC after NVDA was successfully updated.

[LeonarddeR]

On the logon screen, we always start a fresh copy of NVDA. So if you press ctrl+alt+delete for example, a new copy of NVDA starts and is closed as soon as you leave the secure desktop. As the system config copy can create pyc files, this is ok.