stripmatrix expression function

Strips non-essential characters from the string representation of a matrix or vector.

This is useful when you want to interpret the values of the matrix (i.e. to pass to a VEX function).

Returns a string containing the floating point numbers (and only the numbers) which make up the matrix.

stripmatrix(identity(3)) = "1 0 0 0 1 0 0 0 1"

stripmatrix(vector3(1,2,3)) = "1 2 3"