Exception handling

[BookOwl]

It would probably be a good idea to add exception handling to Stack.

[towerofnix]

Need OOP first so that we have a good way to handle it :P

Future possible usage:

{ sup } try dup
`success -> /* property op? */
True =
{ 'All good!' print }
{ 'We got an error:' print `msg -> print }
ifelse

[BookOwl]

I was thinking more like

{ 'Try running this code' print }
{ /* If this gets run, the item on top of the stack is an error object */  'An error occurred' print }
try

[towerofnix]

Works as well.

oop version thing:

{ 'Try running this code' print }
{ `msg -> `msg set 'Error: ' msg concat print }
try