- Transform feedback buffers are now properly cleared when
  the object is deleted
- Transform feedback buffers are now properly detached when
  a buffer is deleted
- Ending a transform feedback now properly sets its PAUSED
  state to false
- Added missing enums to Context::getQueryParameterInfo.
  GL_READ_FRAMEBUFFER_BINDING_ANGLE was also missing, so
  it was also added in this cl.

Change-Id: I286caec119d5ae3adde95c4cce7f0298b8f836c3
Reviewed-on: https://swiftshader-review.googlesource.com/3962Tested-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <capn@google.com>