gb_float22_mul_vec2 and gb_float33_mul_vec3 seem to expect a row-major matrix

[lwky]

It looks like gb_float22_mul_vec2 expects a row-major matrix, instead of column-major. The gbMat struct is column-major, and the operator gbVec2 operator*(gbMat2 const& a, gbVec2 v) implies we're multiplying a matrix with a column vector (and not multiplying a row vector with a matrix).

void gb_float22_mul_vec2(gbVec2* out, float m[2][2], gbVec2 v) {
  out->x = m[0][0] * v.x + m[0][1] * v.y;
  out->y = m[1][0] * v.x + m[1][1] * v.y;
}

it think this should be:

void gb_float22_mul_vec2(gbVec2* out, float m[2][2], gbVec2 v) {
  out->x = m[0][0] * v.x + m[1][0] * v.y;
  out->y = m[0][1] * v.x + m[1][1] * v.y;
}

The same holds for gb_float33_mul_vec3

gb_float44_mul_vec4 is ok.

[lwky]

I see there is already a PR filed for this issue, #44
so this can be closed after merging it.