use sdl_gfx to draw primites
add SDL_Gfx to makefile(s)
update instructions to install dependency (sdl_gfx) with brew
moved SDL mouse logic into mouse class and use the mouse class itself
remove accesing mouse data from map drawing
moved unit selecting logic to game class + use world coordinates
no need to use mouse at map camera
select units with dragged rectangle
make it possible to drag selection in all directions and still select
units
remove comment and add a new one about a bug found
it is now possible to select units using a rectangle
Merge pull request #2 from stefanhendriks/draw-rectangle-with-mouse

Draw rectangle with mouse