#28 Merge support for additional xum1541 devices

[rmueller83]

Here is support for Teensy2: https://github.com/thomask77/teensy-xum1541/commit/35eba1a92410a64f879b3d9164e4a2b040aea1eb
Here is support for Arduino Pro Micro, which is a very cheap device and still available https://github.com/zyonee/opencbm/commit/2e8264cb84d677e48e0a383e5c95b7f12c3250e3

As the devices in the main repo are hard to find today, could you please merge this to avoid fragmentation over several repositories?

[Spiro Trikaliotis]

The problem here is: Who will support these devices? Whenever there is a change, someone will have to fix these two devices, too.
Unfortunately, no one has one, so it is impossible to test it.

That's why it was decided some years ago not to include them in the main repo.

[Spiro Trikaliotis]

Of course, if there would be someone who would be willing to support these devices, things would change.

[rmueller83]

Closed via https://github.com/OpenCBM/OpenCBM/pull/9 ?

[Spiro Trikaliotis]

It is closed.