KeyCapture - extension for key combinations

[benjaminaigner]

The key capture plugin should support keycode combinations (e.g., CTRL+ALT+DEL) as property to trigger the event, similar to the actuator.keyboard plugin.

Following changes are necessary:

• Add a new property "keyString", allowing backwards compatibility. This property allows key combinations, but NOT with integer keycodes. Modifiers will be escaped, similar to actuator.keyboard
• Add a new output port to send out detected key-combinations or to send out every detected key in the same format as it is expected in the keyString property.
• The current input port should be modified: If there is only one number given, it should be interpreted as keycode. If there is a string, it will be interpreted like the property "keyString". If someone needs pressed number keys, one or more numbers need to be escaped, enabling string interpretation.
• Add 2 events, which switch the output port configuration (only detected combinations or "throughput")
• Extend documentation

[deinhofer]

Just tried to capture any key event:
This looks very promising because the NativeKeyEvent class of jnativehook already provides all the information in a convinient way. You can differ between action keys and normal keys and even get the pressed character out (correctly modified, e.g. h or H). Special characters in german also work on Linux and Windows (Mac was not tested yet).

aasasdfghjklöä#+üpoß1235{}{F1}{}{F2}{}{F3}{Shift}{F3}{}{Right Shift}RT{}{Right Shift}5%{}{Right Shift}

The code needed is:
nativeKeyReleased

    	if(nke.isActionKey()) {
    		System.out.print("{"+nke.getModifiersText(nke.getModifiers())+"}{"+nke.getKeyText(nke.getKeyCode())+"}");
    	}

nativeKeyTyped

    	if(!nke.isActionKey()) {
    		System.out.print(nke.getKeyChar());
    	}

So we have everything for this feature and could e.g. learn command combinations, crossplatform!! :-)

Security Notes
As this could easily be misused for password logging, how should we handle security here?

In combinatoin with #79 this could be the solution for unifying key notation within Asterics.

[klues]

for space
nke.getKeyText(nke.getKeyCode()).equals("Leertaste") on my german windows 10. This might be a problem.

also applies for other special keys like Strg or Punkt.