fix(world): separate getting data from the internal and advertised view

Use two functions instead of just one, one showing the actual dimensions 
of the internal "cam" (basically, the whole screen), and one showing the 
advertised displaced camera.

Fixes #16

CHANGELOG.md

@@ -11,6 +11,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - **examples:** Add missing HUD example for one-player plateformer
 
+- **world:** Separate getting dimensions of the internal and advertised view.
+
 ## 0.5.0 - 2019-06-16
 
 - Meta: Add a Code of Conduct

gamecore/modules/world/baseworld.lua

@@ -413,7 +413,7 @@ function BaseWorld:drawMap(id)
   if id ~= nil then
     -- Du à la manière dont fonctionne STI, on est obligé de récupérer les info
     -- de position de camera pour afficher la carte par rapport à ces infos
-    tx, ty  = self.cameras:getViewCoordinate(id)
+    tx, ty  = self.cameras:getInternalCamCoordinate(id)
     scale   = self.cameras:getViewScale(id) or 1
     local vx, vy  = self.cameras:getOnScreenViewRelativePosition(id)
   	tx = math.floor(tx - math.abs(vx))

gamecore/modules/world/camera.lua

@@ -194,15 +194,27 @@ function CameraSystem:detachView(id)
 end
 
 function CameraSystem:getViewCoordinate(id)
+  local view  = self:getView(id)
+
+  local viewx, viewy, vieww, viewh
+  viewx = view.pos.x - (self.views.width/2)
+  viewy = view.pos.y - (self.views.height/2)
+
+  vieww = self.views.width
+  viewh = self.views.height
+  return viewx, viewy, vieww, viewh
+end
+
+function CameraSystem:getInternalCamCoordinate(id)
+  local view  = self:getView(id)
   local cam   = self:getViewCam(id)
 
-  local camx, camy, camw, camh
+  local viewx, viewy, vieww, viewh
-  camx = cam.x - (self.views.width/2)
+  viewx = cam.x - (self.views.width/2)
-  camy = cam.y - (self.views.height/2)
+  viewy = cam.y - (self.views.height/2)
 
-  camw = self.views.width
+  vieww, viewh = core.screen:getDimensions()
-  camh = self.views.height
+  return viewx, viewy, vieww, viewh
-  return camx, camy, camw, camh
 end
 
 function CameraSystem:getOnScreenViewCoordinate(id)