Adds helpers for working with prompts

[jaresty]

• Sometimes it's useful to set the prompt to your clipboard or view in the browser

[C-Loftus]

Ok I am fine with this now. I put this in gpt-beta since I am thinking this might be condensed into the grammar at some point but not sure what that will exactly look like now. I am using model pass <prompt> so it fits the syntax better. model prompt is a bit confusing imo. model pass signifies we are doing a noop where the source is the prompt itself.

Added some comments. Let's try to always get comments on the talon files whenever we add something.

[C-Loftus]

Also moves the code that adds the snip modifier prompt before the code that does the passing. This doesn't change any behavior atm, but in general as a best practice we should be checking special cases after the prompt is finalized by checking modifiers.

[jaresty]

Looks good to me!