handle windows paths from Linux

[AkhilTThomas]

I have a use case where i run the a2ltool from a WSL2 but the A2L contains windows style paths.
This PR handles this scenario.
Example:
/include "Config\McData\Xcp.a2l" cannot be evaluated in WSL2 / Linux

[DanielT]

This is a good improvement.
One minor point: could you please add a test for this code? I'm trying to improve the test quality and test coverage over time, so preferably all new features should also have tests.

[AkhilTThomas]

This is a good improvement. One minor point: could you please add a test for this code? I'm trying to improve the test quality and test coverage over time, so preferably all new features should also have tests.

I have added test cases for linux paths in windows and windows paths in linux.

[DanielT]

Thanks!