2.1rc1

Also adds compilation of MotVoellmy during CI

What's Changed

• Update Scarp.py by @dwolfsch in #1263
• [com1]: add option to only save certain particle props by @awirb in #1273
• [com5] Fix com5 bug on windows plus inconsistencies in code by @fso42 in #1274
• [com1]: time dependent release: allow multiple release features and update standardtests by @PaulaSp3 in #1267
• fix(cfgUtils): handle none strings in numeric conversion checks by @fso42 in #1279
• [com1]: move particle props to one place by @awirb in #1275

Full Changelog: 2.0.1...2.1rc1