Added a 3D benchmark test and benchmarking utilities.
The test also intercepts Gdx.gl now.
Measure useProgram instead of attachShader
Renamed GLBenchmark to GLProfiler.
Removed ProfilingModelBatch. Added static helpers to GLProfiler. Added primitive counter to GLProfiler.
GLProfiler implementations now hidden. All statistic fields are now static.
Vertex and primitive counters are now FloatCounters.
Removed primitive counter.
Removed an unnecessary method.
Merge pull request #1979 from nooone/benchmark

Profiling utilities