InterfaceAdapter implementations for Unity about osvr-unity

[JeroMiya]

Status update:
I found a way to do this without generics and with mostly minimal breaking changes. I went with creating a new base class InterfaceGameObjectBase, which InterfaceGameObject now derives from. OrientationInterface, PositionInterface, and PoseInterface now derive from InterfaceGameObjectBase instead of InterfaceGameObject. This allows existing users of InterfaceGameObject and InterfaceBase to continue working without breaking changes!

Work done:

• Created InterfaceAdapter subclasses for Unity conversions.
• Created InterfaceGameObjectBase, a new base class of OrientationInterface, PoseInterface, PositionInterface, and InterfaceGameObject (exposes InterfaceCallbacks).
• Using the State APIs in OrientationInterface, PoseInterface, and PositionInterface.

Work left to do:

• Classes for each interface type aside from InterfaceBase for components to derive from to inject strongly typed interfaces without attributes or GetComponent usage, like InterfaceBase.
• InterfaceGameObjectBase subclasses for analog and button interfaces, along with respective InterfaceBase-like utility base classes.

[JeroMiya]

OK, this is implemented in a branch here:
master...JeroMiya:Adapters

Could I get a code review? Thanks.

[rpavlik]

Easiest to comment if you start a pull request. Does this eliminate the code that used to be generated by that Lua file? (Just re-noticed that script the other day when doing OSVR-Unity/Managed-OSVR transitions.)

[JeroMiya]

I left InterfaceCallbacks in place for backwards compatibility, so the lua script is still applicable for now. But maybe I should mark those classes as obsolete?

[rpavlik]

Well, if you've got a better way, then please do. I don't remember if anything internal relies on them - it might. (Feel free to modify the lua script to add the deprecated thing and re-generate)

[JeroMiya]

I just marked the class as obsolete. No need to modify the lua script. Pull request is up now:
https://github.com/OSVR/OSVR-Unity/pull/57/files