different tank types

[kamikaz1k]

TODO:

• [x] ~do unit type selection via UI~ won't do
• [x] add 4 tank types spawn them on level start
• [x] add sprites for different tank types

The Tankz:

https://user-images.githubusercontent.com/11997716/198925622-165f1836-e067-4e42-b1b7-fb8fae6eb062.mov

[kamikaz1k]

@nafeu what do you think about just having all your available units on the field? the ability to instantly deploy seems uncessary....

[nafeu]

@kamikaz1k yeah you can go ahead and remove that feature (deploying units on click), honestly that was just a debugging thing