When using DXVK_LOG_LEVEL=debug, the graphics pipeline manager now
prints the names of the shaders used by the pipeline. This shall
help debug driver crashes in vkCreate*Pipelines.
* Improvements for log files
- Added exec name to log files
- Added DXVK_LOG_PATH environment variable to specify the log folder
* Remove .exe from log name
* log: add log level none
* log: corrected type for string position