Log.hpp now does not require the inclusion of any string\stream header.
Moved (most of) the operator definitions to their class.
Now pol2+vec2 is valid and returns pol2
Also vec2+pol2 is valid and returns vec2
Added Font and Glyph classes which one can use
to load ttf files and use them to render characters
fg::Font implements font atlases
fg::Font::Renderer is software-only renderer and uses fg::Image as target