v0.3.35

Trixi v0.3.35

Diff since v0.3.34

Merged pull requests:

• Add TimeSeriesCallback to record states at discrete points (#556) (@sloede)
• Implement P4estMesh with periodic boundaries in 2D (#578) (@efaulhaber)
• Sort unstructured boundary conditions (#583) (@andrewwinters5000)
• Merge main into dev (#592) (@efaulhaber)