mdolab/dafoam: v2.2.4

This release contains the following bug fixes and new features: Implemented the AD calculation for ACT (https://github.com/mdolab/dafoam/pull/98/commits/da004e51735a85ed397899153a8d1ad7d44d5212), AOA (https://github.com/mdolab/dafoam/pull/98/commits/203496b5b0b27ab1e5966266d8e32a6f17ad5e90), and BC (https://github.com/mdolab/dafoam/pull/98/commits/37ee24f4a827e4d7248875cd78bfef3a61c572df) derivatives. Changed the solveCL function in optFuncs.py (https://github.com/mdolab/dafoam/pull/93/commits/1cdcbe8c375f7dd1d25dd16258eb2870ce533628). Now, solveCL can be automatically run before optimization (https://github.com/DAFoam/tutorials/commit/7a15199266cea6eedbb7bcfdc8c3a7e317eefda9). Exposed more functions from the DASolver class such that it can be called externally. Added a feature to write the design variables to a JSON file during optimization (https://github.com/mdolab/dafoam/pull/95/commits/c5e213b552b1a69c3a40b23612bd3b415a318a44) Added a Python script (dafoam_plot3dscale.py) to scale plot3D files (https://github.com/mdolab/dafoam/pull/98/commits/28a53dc01447a3f637b8dabb545ece27f994948e) Fixed an issue that the wallHeatFlux variable was not written to disk (https://github.com/mdolab/dafoam/pull/93/commits/0b6fffd58b6c55d756f01c8e2515e295c6416f6d