Add desktop entry files for Protontricks

Add two .desktop files for Protontricks:

* "protontricks.desktop" simply launches Protontricks GUI
* "protontricks-launch.desktop" associates `protontricks-launch` with
  Windows executables, allowing EXE files to be launched from graphical
  file managers using Protontricks. This can be useful for installing
  patches and mods more easily, and other similar situations.

Fixes #77

MANIFEST.in

@@ -1,10 +1,9 @@
 include MANIFEST.in LICENSE *.md
 
 graft src/protontricks
+graft data
 
 exclude *.yml
 
-prune data
-
 global-exclude *.py[cod]
 global-exclude __pycache__

data/protontricks-launch.desktop

@@ -0,0 +1,9 @@
+[Desktop Entry]
+Exec=protontricks-launch %f
+Name=Protontricks Launcher
+Type=Application
+Terminal=false
+NoDisplay=true
+Categories=Utility
+Icon=wine
+MimeType=application/x-ms-dos-executable;application/x-msi;application/x-ms-shortcut;

data/protontricks.desktop

@@ -0,0 +1,7 @@
+[Desktop Entry]
+Exec=protontricks --gui
+Name=Protontricks
+Type=Application
+Terminal=false
+Categories=Utility;
+Icon=wine

setup.py

@@ -21,6 +21,12 @@
     },
     description=DESCRIPTION,
     long_description=LONG_DESCRIPTION,
+    data_files=[
+        (
+            "share/applications",
+            ["data/protontricks.desktop", "data/protontricks-launch.desktop"]
+        )
+    ],
     author=AUTHOR,
     author_email=AUTHOR_EMAIL,
     python_requires=">=3.5",