updated to latest emscripten.h
Fixed bug where spaces would not appear.
Space character had no width and was not being picekd up by parser.
TextDrawer now has font size option.
updated xml to include font size attribute.
Made copy/move constructors private.
Total overhall of Camera. Basically merged Orthographic into Camera, so Camera is no longer a base class.
Simplified the interface, just have to supply dimensions of orthographic projection box and the rest is calulcated
Only projview matrix is stored as that is all tha is used.
Removed eye, target up and replaced with position, the rest are derived.
Cleaned up constructor, width and height are taken from supplied Camera.
Root now uses new Camera class for default.
modified stress example to use new interfaces.
Removed redundant OrthographicCamera class as the functionaility has been merged with Camera.