In CP.lua: corrected require arguments, and added return table.
In Engine.lua: corrected require arguments and in Runtime:addEventListener change arguments.
In Entity.lua: corrected require arguments.
In World.lua: corrected require arguments, and change some local variables for self variables.
Added an example in main.lua for testing CoronaPunk.
Merge branch 'master' of https://github.com/yusukejoan12/CoronaPunk