Scratch-blocks: Add "clone" or sprite name to "touching []" boolean reporter options

[thisandagain]

Follow-up from LLK/scratch-vm#377

Discussion

In Scratch 3.0 the "touching" boolean reporter can distinguish between itself and a clone. This leads to the question of if this new functionality should be exposed to Scratchers in the form of a new default drop-down option for the "touching []" boolean reporter.

Demo

http://llk.github.io/scratch-vmLLK/scratch-vm#138856666

Reference

---

Moved from LLK/scratch-vm#448
/cc @thisandagain

[mrjacobbloom]

I like this a lot, definitely keep it in!

I can't imagine a use-case from 2.0 that would cause widespread compatability issues, but if you want to be really careful then just have the name of the current sprite always return true.

I'd suggest "clone of myself" to further disambiguate from all clones, but "clone" is fine too

[Tymewalk]

I also like this.

Maybe a separate touching clone of [ v] block, where the options are "myself" and the list of all sprites?