Desktop integration (#2073)

* Open stash in system tray on Windows/MacOS
* Add desktop notifications
* MacOS Bundling
* Add binary icon

Co-authored-by: WithoutPants <53250216+WithoutPants@users.noreply.github.com>

scripts/generate_icons.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+# Update the Stash icon throughout the project from a master stash-logo.png
+
+# Imagemagick, and go packages icns and rsrc are required.
+# Copy a high-resolution stash-logo.png to this stash/scripts folder
+# and run this script from said folder, commit the result.
+
+if [ ! -f "stash-logo.png" ]; then
+    echo "stash-logo.png not found."
+    exit
+fi
+
+if [ -z "$GOPATH" ]; then
+    echo "GOPATH environment variable not set"
+    exit
+fi
+
+if [ ! -e "$GOPATH/bin/rsrc" ]; then
+    echo "Missing Dependency:"
+    echo "Please run the following /outside/ of the stash folder:"
+    echo "go install github.com/akavel/rsrc@latest" 
+    exit
+fi
+
+if [ ! -e "$GOPATH/bin/icnsify" ]; then
+    echo "Missing Dependency:"
+    echo "Please run the following /outside/ of the stash folder:"
+    echo "go install github.com/jackmordaunt/icns/v2/cmd/icnsify@latest" 
+    exit
+fi
+
+# Favicon, used for web favicon, windows systray icon, windows executable icon
+convert stash-logo.png -define icon:auto-resize=256,64,48,32,16 favicon.ico
+cp favicon.ico ../ui/v2.5/public/
+
+# Build .syso for Windows icon, consumed by linker while building stash-win.exe
+"$GOPATH"/bin/rsrc -ico favicon.ico -o icon_windows.syso
+mv icon_windows.syso ../pkg/desktop/
+
+# *nixes systray icon
+convert stash-logo.png -resize x256 favicon.png
+cp favicon.png ../ui/v2.5/public/
+
+# MacOS, used for bundle icon
+# https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFBundles/BundleTypes/BundleTypes.html
+"$GOPATH"/bin/icnsify -i stash-logo.png -o icon.icns
+mv icon.icns macos-bundle/Contents/Resources/icon.icns
+
+# cleanup
+rm favicon.png favicon.ico