debug screen to show loaded objects, fixed particles not getting properly cleaned, canvas cleanup

code/canvas.lua

@@ -9,16 +9,16 @@ function Canvas:New(name)
 
   setmetatable(o, self)
 	self.__index = self
-  Canvas[name] = o
+  return o
 end
 
 function Canvas:Recreate()
 	self.canvas:release()
-	self = Canvas:New(self.name)
+	self = Canvas:New()
 end
 
 function Canvas:Reset()
-	love.graphics.setCanvas(Canvas[self.name].canvas)
+	love.graphics.setCanvas(self.canvas)
   love.graphics.setBlendMode("replace")
 	love.graphics.setColor(0,0,0,0)
 	love.graphics.rectangle(
@@ -33,7 +33,7 @@ end
 
 function Canvas:DrawingStart()
 	self:Reset()
-	love.graphics.setCanvas(Canvas[self.name].canvas)
+	love.graphics.setCanvas(self.canvas)
 end
 
 function Canvas:DrawingEnd()