Allow keyboard input in addition to normal (MIDI/OSC) input.

[helgoboss]

No description provided.

[helgoboss]

Keyboard input is now something that you can choose in addition to OSC/MIDI input. This allows usage of both OSC/MIDI and keyboard sources in one unit. E.g. you could use the Shift key of the keyboard to change the behavior of your MIDI controller (via conditional activation).

Also, the "Let through" options are now ignored for keyboard input! Instead, ReaLearn will use a reasonable default for deciding whether to let keyboard events through or not:

• If no mapping matches, the event will be let through.
• If at least one mapping matches and the key is not a modifier, the event will be filtered out.
• If at least one mapping matches and the key is a modifier, the event will be let through.

Letting through matched non-modifier keys is not possible anymore. I don't see any scenario in this would be desired. If there is a reasonable use case, let me know and I will reintroduce such an option.