Core features to rework before moving into mapping operations

Once 0.0.4 has shipped work can start on editing and saving .vmf files
Not all "core" tools need to exist but brushwork is a focus
Multiplayer will be a focus in 0.0.5's development

Edit (post-deadline):
Turns out selection and refactoring the renderer will take more time.
However the bugfixes and current progress on raycasts and rendering are worth shipping