Small issue w/ Linux compilation due to case-sensitive filenames

[4xx31]

Hey. First of all, thank you for creating this really neat plugin.

I just wanted to let you know that there were some compilation errors on our Linux build machine due to the CogImguiHelper.h file being included as CogImGuiHelper.h. I wanted to create a pull request but don't have time for it, sorry. It's basically replacing:

#include "CogImGuiHelper.h"

with

#include "CogImguiHelper.h"

on the 5 or so files that have the name wrong.

[arnaud-jamin]

Thank you, this is appreciated :)