Add todo.org file with basic target

Add target:
-- Make game looks and feel better
replace package from :org.xzpeter.game.starwar to :com.github.6insanes.starwar
Remove system (ASDF) org.xzpeter.game.starwar.asd
Add system definition (ASDF) com.github.6insanes.starwar.asd
Function clear-global-vars replaced by init-global-vars

I think that name init-global-vars slightly better then
clear-global-vars
Add some reference to original creator of the game
Remove system definition org.xzpeter.game.lib
Add system definition: com.github.6insanes.starwar.lib
Add some spaces between functions

com.github.6insanes.starwar.asd
packages.lisp
Rename bg-color to *background-color*
Rename color-grey to *color-grey*
Refactoring screen(window) options

Group screen variables
Rename screen to window
Group and rename some global variables