Add Rich Presence to PersonaStateEvent

[ralfizzle]

This enables Rich Presence for PersonaStateEvent. Tested and got this example output when receiving a PersonaStateEvent:

2021/12/05 16:04:13 [key:"status" value:"#DOTA_RP_INIT" key:"steam_display" value:"#DOTA_RP_INIT" key:"num_params" value:"0" key:"BattleCup" value:"win_date: 1638666000 valid_until: 1639357200 skill_level: 6 tournament_id: 3398630 division_id: 6 team_id: 8620259 streak: 1 trophy_id: 67" key:"WatchableGameID" value:"0" key:"steam_player_group" value:"27490444881435970" key:"steam_player_group_size" value:"4" key:"party" value:"party_id: 27490444881435970 party_state: UI open: false members { steam_id: 76561198026985442 } members { steam_id: 76561198010457614 } members { steam_id: 76561198110115366 } members { steam_id: 76561198081771288 }" key:"lobby" value:"lobby_id: 27490444942438661 lobby_state: UI password: true game_mode: DOTA_GAMEMODE_AP member_count: 1 max_member_count: 10 name: \"fff\" lobby_type: 1" ]

[Philipp15b]

Thanks!