provide option to NOT verify sketch when debugging starts

[rhbroberg]

I've specified the json in my arduino.json file like this:

...
"output": "../build",
...

which always builds in the same location as it should. Unfortunately, when I start debugging, each time vscode does a build (verify), which is unnecessary. I can see how it's necessary if you're using the temporary directories each time, but if the directory is not temporary I would like an option to disable this behavior - but it's completely unnecessary if an output directory has been specified.