* UnixTimestampConverter should now obey a maximum value
This change prevents an issue where the converter would be unable to
handle obscenely large timestamp values - which are actually quite
common on Discord.
OptionalConverter had to be rewritten to support checking whether or not
an InnerConverter returned an Optional. The perf impacts from this
_shouldn't_ be too bad, as types without a custom parser (which should
be the majority of Optionals in the lib) will bypass the type-check.
* optimizations on OptionalConverter
* Add API-level support for Rich Presences
* Add library-level support for Game presences
* Add model conversions for outgoing+incoming rich presences
* Refactored Game into Activities
* Integrated Activities with user entities
rebase hell from 5f3cb947a92f4fd01cc4df47ca548180036b47f3
* Fix JSON converters for Activities
* Finish rebase, activity should be set on BaseSocketClient
* Use ApplicationId to define a rich presence
* Added SetActivityAsync to Base and Sharded Socket clients
* Remove public parameterless Game constructor
* Remove GameAssets, refactored to GameAsset
* Hide constructors for types that should be read-only
* Revert changes to Discord.Net.sln
got damned visual studio caching
* Refactor GameParty to use dedicated current/capacity values
Per feedback from @khionu
