UWP rework (#1231)

* First draft of UWP rework.

* Read desc

- Moved UWP specific functions to uwp_events.h
- Removed BaseApp.
- Implemented example UWP lifecycle.

* Added GIF recording and screenshot support.

* Character inputs and filesystem stuff

* Fix game closing on Xbox when B is pressed.

* Fix the gamepad binding hack

* Add as many keys as I believe are possible.

* Implemented mouse locking of a sort.

* Remove rogue todo, the rest are for a game dev using this example.

* Implemented touch how I "think" it should work. I cant test this.

* Review.

projects/VS2017.UWP/raylib.App.UWP/raylib.App.UWP.vcxproj

@@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="14.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="Debug|Win32">
@@ -33,7 +33,7 @@
     <MinimumVisualStudioVersion>14.0</MinimumVisualStudioVersion>
     <AppContainerApplication>true</AppContainerApplication>
     <ApplicationType>Windows Store</ApplicationType>
-    <WindowsTargetPlatformVersion>10.0.17763.0</WindowsTargetPlatformVersion>
+    <WindowsTargetPlatformVersion>10.0</WindowsTargetPlatformVersion>
     <WindowsTargetPlatformMinVersion>10.0.17763.0</WindowsTargetPlatformMinVersion>
     <ApplicationTypeRevision>10.0</ApplicationTypeRevision>
     <ProjectName>raylib.App.UWP</ProjectName>
@@ -139,7 +139,6 @@
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="App.h" />
-    <ClInclude Include="BaseApp.h" />
     <ClInclude Include="pch.h" />
   </ItemGroup>
   <ItemGroup>
@@ -152,7 +151,6 @@
     <AppxManifest Include="Package.appxmanifest">
       <SubType>Designer</SubType>
     </AppxManifest>
-    <None Include="packages.config" />
     <None Include="raylib.App.UWP.TemporaryKey.pfx" />
   </ItemGroup>
   <ItemGroup>
@@ -160,6 +158,9 @@
       <Project>{ea91e088-7c71-4f32-b761-e054305cd519}</Project>
     </ProjectReference>
   </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
     <Import Project="..\packages\ANGLE.WindowsStore.2.1.13\build\native\ANGLE.WindowsStore.targets" Condition="Exists('..\packages\ANGLE.WindowsStore.2.1.13\build\native\ANGLE.WindowsStore.targets')" />