Update docs, add Editor script: Create Druid GUI Script, add simple using widgets example

example/examples/using_widgets/using_widgets.collection

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+name: "using_widgets"
+scale_along_z: 0
+embedded_instances {
+  id: "go"
+  data: "components {\n"
+  "  id: \"using_widgets\"\n"
+  "  component: \"/example/examples/using_widgets/using_widgets.gui\"\n"
+  "}\n"
+  ""
+}

example/examples/using_widgets/using_widgets.gui

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+script: "/example/examples/using_widgets/using_widgets.gui_script"
+fonts {
+  name: "text_bold"
+  font: "/example/assets/fonts/text_bold.font"
+}
+fonts {
+  name: "text_regular"
+  font: "/example/assets/fonts/text_regular.font"
+}
+textures {
+  name: "druid_example"
+  texture: "/example/assets/druid_example.atlas"
+}
+nodes {
+  position {
+    x: 861.0
+    y: 545.0
+  }
+  scale {
+    x: 3.0
+    y: 3.0
+  }
+  type: TYPE_TEMPLATE
+  id: "memory_panel"
+  inherit_alpha: true
+  template: "/druid/widget/memory_panel/memory_panel.gui"
+}
+nodes {
+  type: TYPE_BOX
+  id: "memory_panel/root"
+  parent: "memory_panel"
+  template_node_child: true
+}
+nodes {
+  type: TYPE_TEMPLATE
+  id: "memory_panel/mini_graph"
+  parent: "memory_panel/root"
+  template_node_child: true
+}
+nodes {
+  type: TYPE_BOX
+  id: "memory_panel/mini_graph/root"
+  parent: "memory_panel/mini_graph"
+  template_node_child: true
+}
+nodes {
+  type: TYPE_BOX
+  id: "memory_panel/mini_graph/header"
+  parent: "memory_panel/mini_graph/root"
+  template_node_child: true
+}
+nodes {
+  type: TYPE_TEXT
+  id: "memory_panel/mini_graph/text_header"
+  parent: "memory_panel/mini_graph/header"
+  template_node_child: true
+}
+nodes {
+  type: TYPE_BOX
+  id: "memory_panel/mini_graph/icon_drag"
+  parent: "memory_panel/mini_graph/header"
+  template_node_child: true
+}
+nodes {
+  type: TYPE_BOX
+  id: "memory_panel/mini_graph/content"
+  parent: "memory_panel/mini_graph/root"
+  template_node_child: true
+}
+nodes {
+  type: TYPE_BOX
+  id: "memory_panel/mini_graph/prefab_line"
+  parent: "memory_panel/mini_graph/content"
+  template_node_child: true
+}
+nodes {
+  type: TYPE_BOX
+  id: "memory_panel/mini_graph/color_low"
+  parent: "memory_panel/mini_graph/content"
+  template_node_child: true
+}
+nodes {
+  type: TYPE_BOX
+  id: "memory_panel/content"
+  parent: "memory_panel/root"
+  template_node_child: true
+}
+nodes {
+  type: TYPE_TEXT
+  id: "memory_panel/text_max_value"
+  parent: "memory_panel/content"
+  template_node_child: true
+}
+nodes {
+  type: TYPE_TEXT
+  id: "memory_panel/text_per_second"
+  parent: "memory_panel/content"
+  template_node_child: true
+}
+nodes {
+  type: TYPE_BOX
+  id: "memory_panel/line_second_1"
+  parent: "memory_panel/content"
+  template_node_child: true
+}
+nodes {
+  type: TYPE_BOX
+  id: "memory_panel/line_second_2"
+  parent: "memory_panel/content"
+  template_node_child: true
+}
+nodes {
+  type: TYPE_TEXT
+  id: "memory_panel/text_memory"
+  parent: "memory_panel/content"
+  template_node_child: true
+}
+material: "/builtins/materials/gui.material"
+adjust_reference: ADJUST_REFERENCE_PARENT

example/examples/using_widgets/using_widgets.gui_script

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+local druid = require("druid.druid")
+
+local memory_panel = require("druid.widget.memory_panel.memory_panel")
+
+function init(self)
+    self.druid = druid.new(self)
+
+    self.memory_panel = self.druid:new_widget(memory_panel, "memory_panel")
+end
+
+function final(self)
+    self.druid:final()
+end
+
+function update(self, dt)
+    self.druid:update(dt)
+end
+
+function on_message(self, message_id, message, sender)
+    self.druid:on_message(message_id, message, sender)
+end
+
+function on_input(self, action_id, action)
+    return self.druid:on_input(action_id, action)
+end