v2.0.0 - Proper cache and gateway models

[xXBuilderBXx]

• Temp guild bans have now been properly added to Fluxer with customized seconds.
• Renamed SavedMessagesChannel to SavedNotesChannel.
• Added fallback GuildChannel model in case a guild channel type does not have a class.
• Role permissions now use the GuildPermissions class with permissions as properties.
• Channel overwrite permissions now use the ChannelPermissions class with permissions as properties.
• Added gateway socket models for SocketChannel (and types), SocketGuild, SocketRole and SocketGuildMember.
• Added HasPermission(Permission.) on SocketGuildMember and SocketRole (also checks everyone role).
• Added Roles list to SocketGuildMember.
• Added Guild to SocketRole, SocketGuildMember.
• Added EveryoneRole, Members, Channels, Roles, GetMember(id), GetChannel(id) and GetRole(id) to SocketGuild.
• You can now download all members using Client.Gateway.DownloadMembersAsync(guild) which will wait until fetched, returns bool if complete or failed.
• SocketGuild HasAllMembers will be true if all members are cached.
• RtcRegions is now cached on the gateway.
• Added GetCurrentMember(id), GetGuild(id), GetRole(id) and GetChannel(id) to Gateway.