Cast sprite name to string before getSpriteTargetByName

[ktbee]

Resolves

#1743

Proposed Changes

For blocks that use getSpriteTargetByName, cast the sprite name to a string before passing to getSpriteTargetByName. These are the blocks that are fixed by this change:

• Go to
• Glide to
• Point towards
• Create clone of
• Distance to
• X position of
• Touching sprite

Reason for Changes

Currently getSpriteTargetByName doesn't cast sprite names to a string, so any sprites with a number for a name might not be found if a number is the type of the value passed to getSpriteTargetByName. As discussed in #1743, it would generally be better to have this string casting done in one place instead of having the same logic repeated in multiple blocks. I am doing this non-DRY solution for now however because @mzgoddard has plans as part of his performance optimizations to make the string casting happen elsewhere in the VM in one place. That work is being tracked in #2013

Test Coverage

I added sprite-number-name.sb2 as one of the tests run by execute.js.

[kchadha]

Change requested in the code comments.

[kchadha]

LGTM! Thanks!