v0.5.18

Trixi v0.5.18

Diff since v0.5.17

Closed issues:

• MPI: Disable unstable_check in OrdinaryDiffEq for MPI (#339)
• maxiters in trixi_include is not recognized when given as a kwarg after semicolon (#1397)

Merged pull requests:

• Two-layer shallow water equations (#1297) (@patrickersing)
• Fix typo and hyperlinks in docs (#1401) (@JoshuaLampert)
• check for allocations from mortars (#1405) (@ranocha)
• Combined funding logos (#1406) (@andrewwinters5000)
• fix maxiters detection after semicolon (#1407) (@ranocha)