Consistent terminology for coin/token in transfer.

[DimitrisJim]

Opening this after #6364 and #6352 (comment)

Would be nice to use consistent terminology for coins and the newly added Token type so as to not cause confusion when reviewing/changing things. There should be some places where these are used interchangeably (as the review comment pointed out). Some internal private functions could also be renamed to better align with these types.

Can probably be left for until v2 of ics20 is merged.

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[crodriguezvega]

Can we already consider this done?

[DimitrisJim]

I can look through codebase and close if needed (unless you've done so!)

[DimitrisJim]

escrowToken -> escrowCoin, unescrowToken -> unescrowCoin seem to be the only relevant ones. I recall seeing them in a PR, though but maybe the one that was closed, will fix up real quick.

[colin-axner]

thanks, was gonna get to this 👍