Moved information about controls to README.org
Fix bugs after renaming vars
Fix bugs after renaming systems
Remove global *game-thread*

We can access thread via standard sbcl tools
Remove comments and refactor function color-lighten
Put working-with-colors functions to lib/color.lisp
Put functions working with threads to lib/threading.lisp

Add package in-package statement in lib/color.lisp and lib/threading.lisp
Rename lib/misc.lisp to lib/utils.lisp
Make some vector functions look better
Fix package export
Rename vector2rad and rad2vector functions
Fix function name
Improve realization of vector-norm