cUUID: Fix FromHexDigit for digits >= 'a'
cUUID: Fix FromHexDigit for digits >= 'a'

nounoursheureux/MCServer,mc-server/MCServer,mc-server/MCServer,mc-server/MCServer,mc-server/MCServer,nounoursheureux/MCServer,nounoursheureux/MCServer,mc-server/MCServer,nounoursheureux/MCServer,nounoursheureux/MCServer,nounoursheureux/MCServer,mc-server/MCServer