CARCADE Refactor 3: Treat Action (+params and tests)

[allison-li-1016]

Review Time: Medium

Summary: Adding Treat Action class, and associated parameters and tests. The Treat Action will add CAR T-cell agents of specified dose and ratio next to source points or vasculature

Example Input:

<action id="TREAT" class="treat">
     <action.parameter id="TIME_DELAY" value="0" />
     <action.parameter id="DOSE" value="1500" />
     <action.register id="CD8" />
     <action.register id="CD4" />
 </action>

[allison-li-1016]

1. Tests

• Don't test private values

2. Use enums to handle states
3. Don't use 4 array lists just use 1 data structures

[cainja]

I will revisit tests when we address some of the comments. I imagine they will lead to fairly large changes to the tests.

[cainja]

please add an example input file/user interface for the treat action in the PR description