Fix getColor, add/get position

modules/corelib/inputmessage.lua

@@ -35,9 +35,17 @@ end
 
 function InputMessage:getColor()
   local color = {}
-  color.r = msg:getU8()
-  color.g = msg:getU8()
-  color.b = msg:getU8()
-  color.a = msg:getU8()
+  color.r = self:getU8()
+  color.g = self:getU8()
+  color.b = self:getU8()
+  color.a = self:getU8()
   return color
 end
+
+function InputMessage:getPosition()
+  local position = {}
+  position.x = self:getU16()
+  position.y = self:getU16()
+  position.z = self:getU8()
+  return position
+end

modules/corelib/outputmessage.lua

@@ -61,3 +61,9 @@ function OutputMessage:addColor(color)
   self:addU8(color.b)
   self:addU8(color.a)
 end
+
+function OutputMessage:addPosition(position)
+  self:addU16(position.x)
+  self:addU16(position.y)
+  self:addU8(position.z)
+end