Started to integrate render modes into tile renderer again.
RenderModes will be created with a render mode factory and then given
to the particular tile renderer which will call the initialize method
with the tile set, block images, etc. as arguments.
Using picojson library to generate javascript config for ui.
Writing ui config to a config.js file, not index.html anymore.
Workaround for tile size during incremental renderings.
Added render_view option, no validation or use of it in manager code yet