Hide desktop window icon from the Dock and adjust window creation parameters

[dikadk]

Changes default behaviour of choc_DesktopWindow Dock Icon.
It will no longer show up by default, when DesktopWindow is created.

MacOS - NSApplicationActivationPolicyRegular -> NSApplicationActivationPolicyAccessory
Win - hwnd = HWNDHolder (CreateWindowExW (WS_EX_TOOLWINDOW,
windowClass.getClassName(),
L"",
WS_OVERLAPPEDWINDOW,

[mike-malburg]

I don't have enough context to know if this is an appropriate fix or not? Can you please include testing steps either here or in the CommonCpp PR that indicate:

1. What is the undesired behavior we are experiencing before this fix?
2. What is the new desired behavior that occurs after we include this fix?

I think others, or even "future-us" will thank ourselves if we document this somewhere 🙂. Maybe we can get the change upstreamed at some point if this is something that would be desired for other contributors to this library?

Also, it appears this repo is public. While this is required of LGPL libraries, I'm not sure that this is required with ISC licensed libraries? Do we want to make this public, going forward?

[mike-malburg]

Changes look fine to me. I did not test this in-product, but is building and passing all automated tests in CommonCpp.