Update to v1.2.16.2

Several changes were made so that the package would mimic the file
structure of the trial package that the Aseprite team distributes. These
include adding a makedepend on pandoc to convert the README into an HTML
file.

aseprite.desktop

@@ -2,11 +2,13 @@
 Type=Application
 Encoding=UTF-8
 Name=Aseprite
-Comment=Pixel-art paint program
-MimeType=image/bmp;image/gif;image/jpeg;image/png;image/x-pcx;image/x-tga;image/vnd.microsoft.icon;video/x-flic;image/webp;image/x-aseprite;
-Exec=aseprite %U
-Terminal=false
-StartupWMClass=allegro
-Categories=Graphics;2DGraphics;RasterGraphics;
+GenericName=Sprite Editor
+Comment=Animated sprite editor & pixel art tool
 Icon=aseprite
-X-Desktop-File-Install-Version=0.22
+Categories=Graphics;2DGraphics;RasterGraphics
+Exec=aseprite %U
+TryExec=aseprite
+Terminal=false
+StartupNotify=false
+StartupWMClass=Aseprite
+MimeType=image/bmp;image/gif;image/jpeg;image/png;image/x-pcx;image/x-tga;image/vnd.microsoft.icon;video/x-flic;image/webp;image/x-aseprite;