Feature: Auto determine type

[AjaniBilby]

Allow datatypes to be listed as auto and let the compiler resolve the types.

Example use cases

template ( wild T )
void process(T val) { /* do something */ }

int main () {
  auto a = 65 - 23;
  auto b = returnsRect();
  process<auto>(b); // auto fill 
  return 0;
}