Add PicardStage device adapter

This device adapter gives Micro-Manager the ability to control linear and
rotational (twister) stage motors by Picard Industries
(http://wwww.picard-industries.com). These devices are primarily used in
the OpenSPIM single-plane illumination microscopy platform
(http://openspim.org).

The DAL provides three devices: CPiTwister, CPiStage, and CPiXYStage. The
twister device functions like a linear stage, except it implements
SetPositionUm as though it were SetPositionDegrees. A similar approach is
taken to GetLimitsUm and GetStepSizeUm. The single stage device functions
as one would expect, driving a single-axis stage. The XY stage device
groups two such linear stages into an X/Y device.

Please see http://github.com/openspim for full device adapter history
prior to its inclusion in Micro-Manager.

Signed-off-by: Luke Stuyvenberg <stuyvenberg@wisc.edu>
PicardStage DAL: Add CPiDetector

The PiUsb Detector is a method of detecting attached Picard Industries
linear motors and twisters and storing their serial numbers. This lets the
DAL guess at which serial numbers the user will enter, hopefully saving
them a little time.

Signed-off-by: Luke Stuyvenberg <stuyvenberg@wisc.edu>
Add PicardStage DAL to micromanager.sln

This commit is separate since the solution file will likely change prior
to the inclusion of this device adapter.

Signed-off-by: Luke Stuyvenberg <stuyvenberg@wisc.edu>