Title: Entire game on one screen

* TODO INTRO
** intro grafiken einbauen
** spielstart: sprechblase "oh boy, I need to get back" :ruben:
** spielstart: sprechblase "I need to build some energy-collectors" :ruben:

* TODO HUD
** hud: energie progress bar :aaron:

* TODO Entities
** solarpanel item :aaron:

* TODO OUTRO
** win screen