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

data/dialogs/about.xml

@@ -0,0 +1,68 @@
+<?xml version="1.0"?>
+<root
+  xmlns="http://panopainter.com/layout.xsd"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+>
+  
+  <layout id="about">
+    <border positioning="absolute" position="0 0" color=".4 .4 .4 .8" width="100%" height="100%" align="center" justify="center" mouse-capture="1">
+      <border thickness="1" border-color=".2" pad="3" max-width="650" dir="col" width="80%" height="80%">
+        <border width="100%" height="30" color=".2 .2 .2 .9" dir="row" align="center" justify="center">
+          <text text="About PanoPainter"></text>
+        </border>
+        <border width="100%" height="100%" color="0 0 0 .9" pad="10" dir="col">
+          <!--window content-->
+          <border color=".2" width="100%" height="1" grow="1">
+            <scroll pad="10" margin="5" color=".3 .3 .3 .4" height="100%" dir="col" wrap="0" shrink="1">
+              <text margin="0 0 0 5" text=
+"
+--------------------------------------------------- ABOUT PANOPAINTER -----------------------------------------------------
+PanoPainter - Copyright 2018 OmixLab Ltd
+  Thanks for using PanoPainter.
+  My name is Omar Mohamed Ali Mudhir and I'm the developer of this unique application.
+  In the late 2016 Facebook started to make it possible for users to post 360 content
+  captured from the first 360 cameras born after the advent of the VR to the market.
+  
+  That's where me and a bunch or artists started to wonder about making art in 360.
+  I then started coding in my spare time to create something that would have helped 
+  artists in the long process of creating a panoramic painting (panopainting).
+  
+  Today this software has evolved a lot and reached a mature version ready for early 
+  adopters that want to break the rules of traditional digital art and get into the 
+  future of immersive painting.
+  
+  Feel free to follow me on:
+  - Instagram: @panopainter
+  - Twitter: @panopainter
+  - Facebook: fb.me/panopainter
+  - Reddit: reddit.com/r/panopainter
+  
+                      
+------------------------------------------------- FREE SOFTWARE LICENSES -------------------------------------------------
+Free brushes:
+  The free brushes are provided by the freely available Brush Pack v3 from Fenris31
+  Link: https://www.deviantart.com/fenris31/art/Brush-Pack-v3-549566626
+  
+Roboto Font License:
+  Copyright 2018 OmixLab Ltd
+  Licensed under the Apache License, Version 2.0 (the 'License');
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+      http://www.apache.org/licenses/LICENSE-2.0
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an 'AS IS' BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License."/>
+            </scroll>
+          </border>
+          <!--footer buttons-->
+          <node height="60" dir="row" justify="flex-end">
+            <button id="btn-ok" text="Ok" width="100" height="30" margin="5 0 0 0"/>
+          </node>
+        </border>
+      </border>
+    </border>
+  </layout>
+
+</root>