Convert all performances in Test_files

[probonopd]

When merged, this will:

• Convert all performances in Test_files using the .sh scripts provided in that directory
• Upload artifacts
• Create and upload to GitHub Releases

Here you can already see what it produces:
performances.zip

[probonopd]

To make this more useful, automatic -n numbering would be good to have in MDX_PerfConv so that the number would be automatically increased based on which files already exist in the current working directory. Also, the output files should be saved in the current working directory rather than in the same directory as the input files.

This way, no values for -n would need to be hardcoded anywhere.

[BobanSpasic]

The output numbers are already too high, much higher than 256. I need to think about a solution.

[probonopd]

For now, we can use directories - let me try something... more soon.

[probonopd]

The converted files are now in folders, just like the input files.