Fixed include problems and compilation errors

[Maniform]

• Replaced bad include definitions
• Define Format function as a Windows only
• Removed AssertMsg and include assert which causes problems

I tested to compile on Windows 10 and Ubuntu 21.04 and it worked on both of them. I've noticed a bit too late that an other quite similar pull request has been asked here : [https://github.com//pull/1524]. I don't know if it's a problem or not.

[okawo80085]

assert.h includes are not handled the best way, those asserts still serve a purpose and just removing them is not the best idea, but adding assert.h into vrcommon would break standard library assert.h includes.
So either add a file like assert<suffix>.h and in it define a simple print on assert function using static assert from the standard library assert.h
OR
Add assert.h but define a full fledged AssertMsg in it and add a define for assert since it is used in jsoncpp.cpp

[okawo80085]

Also you missed a stdarg.h include in strtools_public.cpp