Add setting to probe module to allow for probing internal corner

[riaanmarx]

I would like to suggest a setting for the probe module to select outer vs inner corner probing on the X and Y Axis.
The current implementation does outer corner probing.
I have a probe target that is conductive on the inside of the corner requiring the probe to meet the target sides (X and Y) from over the workpiece.
The setting should allow the user to pick either "Outer corner", or "Inner corner", and just change the positioning probe path (G1/G35) accordingly.
An example of a similar setup can be seen here: https://www.youtube.com/watch?v=GllP7wtxpfY @ 10:51

[riaanmarx]

Ok, the hyperlink to the video is giving a 404 (not found) if you click on it, but if you copy and paste that URL into your browser it actually does exist.