Allow multiple parallel HOGP connections#1597
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This is the PR achieving multiple parallel HOGP connections. To allow for this, a new concept is introduced, the
hid::session. This object has the lifetime of an HID connection, in the case of USB as long as the device is configured, in the case of BLE from the point where a HOGP attribute is accessed until disconnection. In the case of BLE, eachbt_connneeds its ownhid::session, and this is the part that's not implemented yet, because I don't know the full context. @kareltucek I ask you to go over this and implement the newTODOs in the changes, and all the adaptations for the new connection switching logic.I have only done a quick smoke test on this first branch version with UHK60, UHK80 is guaranteed not to work without further changes.
Closes #1549