"underscore" as seperator for file names

[Sahnreis]

Description

Fixes issue #129 Switched from spaces as file name seperator to "_" (underscore) and updated .gitignore to include the new file names.

Type of change

Put an X in the relevant boxes

• [x ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How Has This Been Tested?

Please generally describe the tests that you ran to verify your changes. Provide instructions so we can reproduce.

• Did multiple exports and checked file names afterwards to verfiy.

Test Configuration:

• OS: Win 10
• Hardware:
• Toolchain:
• SDK:

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have adequately commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [x ] My changes generate no new warnings (if there are any, note them and why they could not have been removed)
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules

[Sahnreis]

hey @odedshimon have you found some time to have a look at the pr?

[odedshimon]

@Sahnreis Hey, Thank you for opening this PR. Normally I respond fater, sorry for that. I'm currently abroad and therfore didn't have the time to look at it so far. I will be back by the end of April and will check that for sure shortly after!