Neon optimization of some functions of core module

I would add Newton-Raphson iterations to compute square root right inside the loop. Probably, you can add a macro, since this will be needed in a few places in this file: https://github.com/juj/MathGeoLib/blob/master/tests/NEONTests.cpp (inverse square root is computed there, and there should be 2 iterations (using vrsqrtsq_f32), not 1).