Update TypeOfTower
change image paths
replace Sprite by BufferedImage
Add a default display of Tower Type
Add all void herited Tower class
Add Copy Constructors in Tower and TowerAttack
Add Copy Constructor for every other tower class
Add simple choice between two specialized Tower
Add graphic and engine process to choose between 2 specialized tower
Merge branch 'master' of https://github.com/cchampet/Java_nanowars.git

Conflicts:
	src/dispatcher/Dispatcher.java
	src/engine/Engine.java
	src/engine/Tower.java
	src/engine/TowerAttack.java
	src/playable/Player.java
	src/renderer/Renderer.java
	src/renderer/UIRenderer.java
Merge branch 'master' of https://github.com/cchampet/Java_nanowars.git