enable complex type for PIMathVectorT and PIMathMatrixT

TODO: add precision to invert and test vector

libs/main/math/pimathcomplex.h

@@ -36,6 +36,12 @@
 
 using std::complex;
 
+template<typename T>
+struct is_complex: std::false_type {};
+
+template<typename T>
+struct is_complex<std::complex<T>>: std::true_type {};
+
 typedef complex<int> complexi;
 typedef complex<short> complexs;
 typedef complex<float> complexf;