split layout.xml into multiple files loaded on demand, update changelog

data/dialogs/panel-quick.xml

@@ -0,0 +1,46 @@
+<?xml version="1.0"?>
+<root
+  xmlns="http://panopainter.com/layout.xsd"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+>
+
+  <layout id="tpl-panel-quick">
+    <border color="0 0 0 0.6" width="80" dir="col" pad="5" align="center" mouse-capture="true" shrink="1">
+      <node dir="row" pad="5" shrink="1" min-height="100" max-height="200">
+        <!--size-->
+        <node dir="col" margin="0 4 0 0" height="100%" align="center">
+          <text text="Size" margin="0 0 10 0"/>
+          <slider-v id="quick-size" height="200" shrink="1" width="30"/>
+        </node>
+        <!--flow-->
+        <node dir="col" align="center" height="100%">
+          <text text="Flow" margin="0 0 10 0"/>
+          <slider-v id="quick-flow" height="200" shrink="1" width="30"/>
+        </node>
+      </node>
+      <!--color-->
+      <text text="Colors" margin="10 0 5 0"/>
+      <button-custom id="quick-color1" dir="row" pad="4" margin="0 0 1 0">
+        <border color="0 0 0 1" width="60" height="30"/>
+      </button-custom>
+      <button-custom id="quick-color2" pad="4" margin="0 0 1 0">
+        <border color="0.5 0.5 0.5 1" width="60" height="30"/>
+      </button-custom>
+      <button-custom id="quick-color3" pad="4" margin="0 0 1 0">
+        <border color="1 1 1 1" width="60" height="30"/>
+      </button-custom>
+      <!--brushes-->
+      <text text="Brushes" margin="10 0 5 0"/>
+      <button-custom id="quick-brush1" height="45" pad="4">
+        <stroke-preview width="60" height="100%"/>
+      </button-custom>
+      <button-custom id="quick-brush2" height="45" pad="4" margin="4 0 0 0">
+        <stroke-preview width="60" height="100%"/>
+      </button-custom>
+      <button-custom id="quick-brush3" height="45" pad="4" margin="4 0 0 0">
+        <stroke-preview width="60" height="100%"/>
+      </button-custom>
+    </border>
+  </layout>
+
+</root>