improve how bound arguments are stored.

[EdAyers]

Resolved by #78 Continuation of #43.

Starting with #78 , there is lots of extra info that we would like to store with the args:

• was it a default argument assignment? these can be shown in grey
• some type annotation info about the argument (this should be associated with the function definition not the evaluation or argument) so this should be its own issue.
• the'kind' of parameter, python has 5 different kinds
• the ordering of the arguments is also important, they should be shown in that order.

[EdAyers]

done