ENH: C# namespace changed to uppercase as per C# convention, more wrappings added (DataArray, SelectEnclosedPoints, & Pbd constraint type stiffness pairs)

Previously the instance of the haptic device might have been in the middle of processing
a callback as the destructor gets exectued, calling hdUnschedule should prevent this

Also defers posting of the button events to the update call to prevent another process
from holding up the callback

REFAC: Further build improvements, more example fixes, few more swig wrappings, connect & actions simplified

After default default contructing a vecdataarra a resize(1) would fail to set the size correctly
This fixes this and adds tests to this case

(cherry picked from commit afae902d6b2760734b8f19cc469dc1e78737459a)

We don't have std::unordered_map implemented atm, it's easier to ignore the function

(cherry picked from commit 784ecf84)

Update gtest to latest

Also keep track of registered clients