Additional dynamic parameter support

[scott-taubman]

Certain types of dynamic parameters still do not work properly. Any attempt to task them will effectively break the entire UI. One such example is the evaluate command in the dynamic example plugin.

Other types do not break the entire site, but simply do not render anything on the tasking screen. One such example is the say_specific_dictionary_with_key_reference command.

The first goal of this issue is to make it these specific example commands (dynamic/evaluate and dynamic/say_specific_dictionary_with_key_reference) work properly. If at all possible however, we should really make it so that dynamic commands just generically work and are less of a specific code path for each and every variation.

Bonus points if we can make it so that the entire application doesn't break in the event that an error is encountered when handling an unsupported dynamic parameter.