Add a mechanism for getting/setting the clipboard text

[Perksey]

Summary of feature

Currently, there is no clean way to get/set the clipboard text from the input API - you end up having to use GLFW and SDL directly which isn't ideal or user friendly.

This issue is to add a gettable and settable property onto IKeyboard (probably called ClipboardText).

Comments

The work is:

• Add a get/set property onto IKeyboard (probably called ClipboardText)
• Implement this in GlfwKeyboard using the appropriate GLFW functions exposed in the Glfw class
• Implement this in SdlKeyboard using the appropriate SDL functions exposed in the Sdl class.

If your IDE is running slow, you can make a stripped down solution containing only input projects using nuke sln --projects input

Please see CONTRIBUTING.md for more info on contributing.

Area owner is @ThomasMiz

Does this have a proposal?

This is exempt from a proposal as described in the proposals readme.

[Perksey]

If you would like to take this issue please leave a comment!

[Beyley]

Ill attempt to implement this

[Perksey]

Assigned, thanks :)

[ThomasMiz]

While checking PR #733 I want to ask, why is this implemented on IKeyboard? Why not IInputContext, or in the windowing packages on IWindow?

[Perksey]

This was primarily my call, clipboard is more of a human input thing so it belongs in Input and not Windowing.

But on the IInputContext vs IKeyboard, either is technically acceptable but I mainly leaned towards the latter as IInputContext is mainly just an "owner of input devices". I did briefly consider making an IClipboard but that seemed overkill.