Next pass is clean-up and fix of all the old usage

We have no hope of extending lua_State to add more data to it, because
that object may be created by Lua itself, for instance within a coroutine,
and it has no knowledge of our version of the object.

The containers no longer force the user to use the ptrdiff_t type for
size information. For convenience, size() now always returns an int,
and the size_s() method offers a way to handle arrays with more than
2 billion elements. Internally, we still use ptrdiff_t, though.

Since so much code had to be changed, I took the opportunity to get
rid of capitalised accessors for classes that are lowercase.

Reworked Primitive logic for scene rendering
FileUpdateTester works now .....

MeshViewer first pass

Add SafeEnum var in lua
MeshViewer SceneSetup is operational
Added imGui to vs-solution, not implemented yet

SceneSetup : Added ClearColor command
EZMesh : Added Dup[ ... ] command && cgs command syntax refactor
MViewer : Tweak & dictionnary.js updates

entity : Added IsTicked