Add automatic probe layout for 3brain/biocam recordings

[mahlzahn]

I don’t really know how 'Model' is called inside of the 'ExperimentSettings' for other systems than the 'AccuraV2' and 'AccuraV2_3D' (these are the models which are in the files on ephy_testing_data). Thus, I am guessing that their lowercase versions start with 'stimulo' and 'coreplate'.

Although I changed the default value of the electrode parameters to None, the default for the old Brainwave4 (brw v3.x) format is still 42 μm and 21 μm. Only for the new Brainwave5 (brw v4.x) format the automatic setting is performed.

References for electrode parameters:

• https://www.3brain.com/products/single-well/hd-mea
• https://www.3brain.com/products/multiwell/coreplate-multiwell