Added timer class and made minor changes to moveablebody
Removed health variables from player
Removed leftover from health in player
Added pause-button and moved healthbar
Changed timer class name and added possibility to get infected and loose health
Added change in color of healthbar when infected
Modified the pause-menu

The itemview now hides/show when pausing/unpausing. Also, the game
fully stops when you pauses.
The gamescreen is now partially hidden when you pause
Changed healthbar to always have both infected and normal although only showing one at a time depending on state
Humans and zombies have health. Humans can die and are removed from the game if they do
Added zombies when human dies
If already colliding, dont change anything
Changed back to default values
Added some debug and maybe a fix for an bug
Now uses the already implemented addZombie function to add a zombie
Merge branch 'infectedhealth' into develop
Updated player for 16x16 tiles
Merge branch 'images' into develop

Conflicts:
	zombie-world/src/se/glory/zombieworld/model/WorldModel.java
	zombie-world/src/se/glory/zombieworld/screens/GameScreen.java
Resolved merge conflict
Made the viewport a bit bigger