Added some structor concepts

expcore/gui/concepts/line.lua

@@ -0,0 +1,25 @@
+--[[-- Core Module - Gui
+    @module Gui
+    @alias Gui
+]]
+
+local Gui = require 'expcore.gui.core'
+
+--[[-- A vertical or horizontal line.
+@element line
+@tparam string direction the direction that children will be added
+@usage-- Making a basic frame, contains a label with hello world
+local basic_line =
+Gui.clone_concept('line','basic_line')
+]]
+Gui.new_concept('line')
+:new_property('direction')
+:define_draw(function(properties,parent,element)
+    element = parent.add{
+        name = properties.name,
+        type = 'line',
+        direction = properties.direction
+    }
+
+    return element
+end)