Add a setting in KM to not fill clipboard with pasted text for `Insert text by pasting` action

[JMichaelTX]

@nikivi

I can get around this by clearing the clipboard after the action every time I use it (very annoying).

If you use MACRO: [KMFAM] Favorite Actions and Macros by @DanThomas, you can easily workaround this inconvience. Just create a Favorite Action that is both the Insert Text by Pasting AND Delete Current Clipboard.

I make great use of Dan's KMFAM system, and it works very well.