Integration of USABLE PA devices about simpa

[kdreher]

We should implement default illumination and detection devices separately and an additional PA device generator that takes one illumination and one detection device from our predefined devices and generates the respective PA device.
This way, users have a lot more choices to construct a PA device "on the fly". Also, it is more elegant to just simulate the optical or acoustic models without having to choose a PA device when there is no PA effect involved.

Specific products like the MSOT devices can still stay the way they are.

[jgroehl]

It might be worth considering creating new classes for the DetectionGeometry and IlluminationGeometry and having a PADevice class that is a combination of the two?
The settings file would then be assigned the PADevice instance, where one of the two could be None thus achieving what you propose?

[jgroehl]

Potentially found an "off-by-one" error in the Python to MATLAB conversion when defining the detector positions. MATLAB indexing starts with 1, not 0, which we apparently did not consider previously.

[jgroehl]

Work on this will also fix #49.

[jgroehl]

Linear and curved detection geometries are now implemented.

[jgroehl]

Implemented all previously available devices.
Custom devices that combine the illumination and detection geometries can now easily be added.

@kdreher I propose we discuss the current implementation, integrate it into develop and start adding more detection and illumination geometries in a new task.

[jgroehl]

Will work towards #11, #19, and #12 within these changes.

[jgroehl]

Opened new task #61 for the addition of further geometries that should be in SIMPA.
Closing, as it is integrated in #57