[FEATURE] AddOn abstract class that allows for between mod's communication

[LuxStice]

Feature Information

Feature description

An abstract class that the mod developer can inherit from to create a public facing API to be used by other modders to communicate with his mod. He would redestribute that on his github (or wherever he likes) so that other modders could download that, add to their codes and use the methods without having to reference the original code.

Solution proposal

Something like what RemoteTech2 has with its abstract AddOn class

Additional context

This came from this chat in discord where the modder couldn't properly build an integration with ManeuverNodeController properly. He had to use reflection to achieve the desired behaviour.

[jan-bures]

For reference, here is such an abstract class in KSP 1:
https://github.com/RemoteTechnologiesGroup/RemoteTech/blob/develop/src/RemoteTech/SimpleTypes/AddOn.cs

And here is an example implementation in KSP 1: https://github.com/RemoteTechnologiesGroup/RemoteTech/blob/develop/src/RemoteTech/AddOns/KerbalAlarmClockAPI.cs

Both examples taken from the RemoteTech mod.

[cheese3660]

#252 adds a message bus system, which when used with a parameter that can store state does much the same thing