Sync Steamworks SDK headers with 1.60, released in July.

P4:9152589,9152646
(cherry picked from commit 291f32cb6b)

include/steam/steamclientpublic.h

@@ -142,6 +142,7 @@ enum EResult
 	k_EResultCachedCredentialInvalid = 126,		// Cached credential was invalid - user must reauthenticate
 	K_EResultPhoneNumberIsVOIP = 127,			// The phone number provided is a Voice Over IP number
 	k_EResultNotSupported = 128,				// The data being accessed is not supported by this API
+	k_EResultFamilySizeLimitExceeded = 129,		// Reached the maximum size of the family
 };
 
 // Error codes for use with the voice functions
@@ -460,6 +461,16 @@ enum EDurationControlOnlineState
 };
 
 
+enum EBetaBranchFlags
+{
+	k_EBetaBranch_None			= 0,
+	k_EBetaBranch_Default		= 1,	// this is the default branch ("public")
+	k_EBetaBranch_Available		= 2,	// this branch can be selected (available)
+	k_EBetaBranch_Private		= 4,	// this is a private branch (password protected)
+	k_EBetaBranch_Selected		= 8,	// this is the currently selected branch (active)
+	k_EBetaBranch_Installed		= 16,	// this is the currently installed branch (mounted)
+};
+
 #pragma pack( push, 1 )
 
 #define CSTEAMID_DEFINED

include/steam/steamtypes.h

@@ -98,6 +98,7 @@ typedef uint64 SteamAPICall_t;
 const SteamAPICall_t k_uAPICallInvalid = 0x0;
 
 typedef uint32 AccountID_t;
+const AccountID_t k_uAccountIdInvalid = 0;
 
 // Party Beacon ID
 typedef uint64 PartyBeaconID_t;