What would be the best process to convert a very old ANSI charset based Win32 application to UNICODE? The source code is currently compiled with Delphi7. Would it be best to make this conversion with which Delphi version? I have currently a license for XE6 version, is it worth of using that one?

Wrote functions for TShape, TRect and TMatrix objects.The TShape and TRect functions are similar so that you can call and create a collision for each object by changing the parameters.The goal is to make a collision like this (example on codepen and JavaScript) so that it counts when the borders of the squares intersect.