Layer 179, getPropicInfo & getFullInfo improvements

Features:

• Make getPropicInfo, getFullInfo and getPwrChat return Photo objects for profile pictures, compatible with sendPhoto methods.
• Make getPwrChat return a bit more info with fullfetch=false
• Update to layer 179

New Methods:

• auth.reportMissingCode

New Constructors:

• auth.sentCodeTypeSmsWord
• auth.sentCodeTypeSmsPhrase