G20/21 and M149 support, and code_value() refactor

This is an update of MarlinDev PR #196.

G20/21: support for switching input units between millimeters and
inches.
M149: support for changing input temperature units.

In support of these changes, code_value() and code_value_short() are
replaced with an array of functions which handle converting to the
proper types and/or units.
This commit is contained in:
Reid Rankin authored and Scott Lahteine committed 2016-06-08 16:51:10 -07:00
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