add AYON context to the AYON menu

[MustafaJafar]

Changelog Description

resolve #11

Testing notes:

1. Launch c4d via AYON Launcher
2. Check if AYON context is shown properly.

[BigRoy]

I'm quite confident that this will not update the label on folder/task changes - it's not live but the menu is built one. We'd need a dynamic menu label otherwise (not sure how to do that).

Which means the label that would be displayed would not be accurate.

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Here's a younger me on how to define a custom menu for Cinema4D: https://developers.maxon.net/forum/topic/12103/custom-menu-in-c4d-top-menu-bar-with-custom-python-commands

This http://developers.maxon.net/forum//post/70228 seems to describe there is some way to update menus later. But I'm not sure how/where exactly.

[MustafaJafar]

I was able to test this PR.
The context label doesn't even appear.

[MustafaJafar]

Now, the AYON context is shown BUT as @BigRoy mentioned above, it's static and not updated on context change.

[BigRoy]

Some minor notes - other than that this looks good!

[BigRoy]

What did you base this number on @MustafaJafar - is this officially registered with Maxon?

[MustafaJafar]

Honestly, I don't know.

I assume these are unique numbers to register the plugins/commands. I picked the smallest number - 1 in the pyp file.

[MustafaJafar]

In my last commit, I've added AYON icon. Please let me know if you don't like it :) @BigRoy

[BigRoy]

Thanks so much - looking very nice!