Add "Debugger" button

[eriktrautman]

Add a button that quickly fires up our block explorer / debugger. Best case is in-line with the Run and Test buttons and having it open in a new tab. Else it's not clear for the newbie how to debug things.

Honestly unsure what the best syntax is -- it's technically the "Explorer" (with explorer icon) but "debugger" (with a bug icon) is more inline with why someone from the IDE . would want to click it in that context.

[vgrichina]

I think the best would be to make specific transactions linked from JS console (i.e. Nearlib error / success messages should include link to debugger).

[vgrichina]

Probably also makes sense to have "Recent transactions" pane in studio somewhere as well

[vgrichina]

Also after thinking about it for a while – we also can make a real debugger. Every transaction in explorer, etc can have a "Debug" link which will try to run contract code in browser (with same inputs).