changed virus to vector
updated gfx
added operator+ operator- and length
added a reference to the gameboard that a tower belongs to
added missing include
fixed compile error
getters for viruses, towers, projectiles
implemented basic tower
Merge branch 'tower_basic' of github.com:langest/terminal_defense into tower_basic
moved projectile files
dead virus wip
Merge branch 'tower_basic' of github.com:langest/terminal_defense into tower_basic
moved projectiles
updated imports
fixed sgnature of operator=
updated remove
removed unnecessary f flag
solved compile issue
updated order of :-list to avoid warning
forward declaration