BGE Python API

- More verbose error messages.
- BL_Shader wasnt setting error messages on some errors
- FilterNormal depth attribute was checking for float which is bad because scripts often expect ints assigned to float attributes.
- Added a check to PyVecTo for a tuple rather then always using a generic python sequence. On my system this is over 2x faster with an optmized build.

source/gameengine/GameLogic/SCA_RandomSensor.cpp

@@ -224,7 +224,7 @@ int SCA_RandomSensor::pyattr_set_seed(void *self_v, const KX_PYATTRIBUTE_DEF *at
 {
 	SCA_RandomSensor* self= static_cast<SCA_RandomSensor*>(self_v);
 	if (!PyInt_Check(value)) {
-		PyErr_SetString(PyExc_TypeError, "expected an integer");
+		PyErr_SetString(PyExc_TypeError, "sensor.seed = int: Random Sensor, expected an integer");
 		return -1;
 	}
 	self->m_basegenerator->SetSeed(PyInt_AsLong(value));