added ship textures

core/assets/ship/circle/circle_cruiser_base.png

core/assets/ship/circle/circle_cruiser_floor.png

core/assets/ship/circle/circle_cruiser_shields1.png

core/assets/ship/cruiser/kestral_base.png

core/assets/ship/cruiser/kestral_floor.png

core/assets/ship/fed/fed_cruiser_base.png

core/assets/ship/fed/fed_cruiser_floor.png

core/assets/ship/fed/fed_cruiser_shields1.png

core/assets/ship/kestral/kestral_base.png

core/assets/ship/kestral/kestral_floor.png

core/assets/ship/kestral/kestral_shields1.png

core/assets/ship/rock/rock_cruiser_2_floor.png

core/assets/ship/rock/rock_cruiser_base.png

core/assets/ship/rock/rock_cruiser_floor.png

core/assets/ship/rock/rock_cruiser_shields1.png

core/assets/ship/stealth/stealth_base.png

core/assets/ship/stealth/stealth_floor.png

core/assets/ship/stealth/stealth_shields1.png