massive cleanup & features

fixed issues #2 and added an optional human readable format

switched to (hopefully) more stable resource conversion

reduced performed operations per frame roughly by 50%

removed the addon for editor display
removed PartExtensions
refactored code
fixed in-editor display
Merge remote-tracking branch 'upstream/master'

Conflicts:
	USI_Converter/USI_Converter/Log.cs
	USI_Converter/USI_Converter/PartExtensions.cs
	USI_Converter/USI_Converter/USI_Converter.cs
	USI_Converter/USI_Converter/Utilities.cs
Merge pull request #9 from marce155/master

fixed in-editor display