Add wxAddRemoveCtrl

[KeyWorksRW]

Description:

wxAddRemoveCtrl -- https://docs.wxwidgets.org/trunk/classwx_add_remove_ctrl.html

We should be able to at least add a listbox version of this. For the four functions, we could use code snippets -- edited and saved similar to what we use for lambdas. The derived class would use the base class name as the prefix to make it unique, and would be defined in the source file where the wxAddRemoveCtrl is created.