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.
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						Scott Lahteine
					
				
			
			
				
	
			
			
			
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