Add a configurable spindle value to use for 100% power. Marlin uses 100, others use 1.0, stock Grbl use 1000, some use 255.

Useful for saving to an usb-mounted smoothieboard or an sd card, instead
of manually saving to a fixed path each time.

Add configurable option to blank laser during G0 rapid moves. Fixes issues in PR #38 for Smoothie boards

can be adjusted if user is finding they constantly get `java.io.IOException: Underlying input stream returned zero bytes `

timeout would cause the following error: "java.io.IOException: Underlying input stream returned zero bytes"