Update gauge.xsd
Update gauge.xsd

updated Gauges.xsd to 
1) provide pattern validation on ImageSizes to ensure that it has for coordinates (x,y,z,w) where x,y are the 640 directory sizes and z,w are the 1024 directory sizes
2) Added Failures element with the failure types documented in Prepar3d v5 SDK
3) Added DegreesPointsTo attribute to GuageImage
c0nnex/SPAD.neXt,c0nnex/SPAD.neXt