add share button and implement AirDrop share in OSX, update info.plist to set on Mac OS the default app for PPI, on iOS include the Documents/Inbox subfolder used to store the received files from AirDrop

QLPlugin/Info.plist

@@ -7,6 +7,8 @@
 	<key>CFBundleDocumentTypes</key>
 	<array>
 		<dict>
+			<key>CFBundleTypeIconFile</key>
+			<string>pp-icon-square</string>
 			<key>CFBundleTypeExtensions</key>
 			<array>
 				<string>ppi</string>
@@ -16,7 +18,7 @@
 				<string>image/ppi</string>
 			</array>
 			<key>CFBundleTypeName</key>
-			<string>PPI</string>
+			<string>PanoPainter Image</string>
 			<key>CFBundleTypeRole</key>
 			<string>QLGenerator</string>
 			<key>LSItemContentTypes</key>
@@ -70,6 +72,8 @@
 	<key>UTImportedTypeDeclarations</key>
 	<array>
 		<dict>
+			<key>UTTypeIconFile</key>
+			<string>pp-icon-square</string>
 			<key>UTTypeConformsTo</key>
 			<array>
 				<string>public.data</string>