A template defined in a module interface is instantiated in the importing
unit, where its body's types must be complete. A declaration reaching the
importer only through the interface's global module fragment is not
enough for MSVC: cParser::operator>> uses std::stringstream, and every
unit that parsed a float got an incomplete type.
526 headers across 161 units, derived from what each interface's template
bodies actually name.
Shift isn't used as that would affect joystick controls and we
probably should discourage the user from roaming around in external
cam mode too much, so they won't forget that they're not in regular
free fly out of the cab.
Update Init(...) parameters to glm::dvec3, change LookAt to glm::dvec3 and adjust Camera.cpp to remove redundant glm::dvec3 casts (lookAt call and vector subtraction). These changes improve precision for camera lookAt vector in world coordinates above 4 digits
