Concise NearZero function

In math library, the extra branching statement for NearZero function is redundant
Original
```
	inline bool NearZero(float val, float epsilon = 0.001f)
	{
		if (fabs(val) <= epsilon)
		{
			return true;
		}
		else
		{
			return false;
		}
	}
```

Suggested:
```
	inline bool NearZero(float val, float epsilon = 0.001f)
	{
		return fabs(val) <= epsilon);
	}
```