macos: Add updater support (#4464)

This is a very basic updater but should be enough for now.

---------

Co-authored-by: TSRBerry <20988865+TSRBerry@users.noreply.github.com>

distribution/macos/updater.sh

@@ -0,0 +1,39 @@
+#!/bin/bash
+
+set -e
+
+INSTALL_DIRECTORY=$1
+NEW_APP_DIRECTORY=$2
+APP_PID=$3
+APP_ARGUMENTS="${@:4}"
+
+error_handler() {
+    local lineno="$1"
+
+    script="""
+    set alertTitle to \"Ryujinx - Updater error\"
+    set alertMessage to \"An error occurred during Ryujinx update (updater.sh:$lineno)\n\nPlease download the update manually from our website if the problem persists.\"
+    display dialog alertMessage with icon caution with title alertTitle buttons {\"Open Download Page\", \"Exit\"}
+    set the button_pressed to the button returned of the result
+
+    if the button_pressed is \"Open Download Page\" then
+        open location \"https://ryujinx.org/download\"
+    end if
+    """
+
+    osascript -e "$script"
+    exit 1
+}
+
+trap 'error_handler ${LINENO}' ERR
+
+# Wait for Ryujinx to exit
+# NOTE: in case no fds are open, lsof could be returning with a process still living.
+# We wait 1s and assume the process stopped after that
+lsof -p $APP_PID +r 1 &>/dev/null
+sleep 1
+
+# Now replace and reopen.
+rm -rf "$INSTALL_DIRECTORY"
+mv "$NEW_APP_DIRECTORY" "$INSTALL_DIRECTORY"
+open -a "$INSTALL_DIRECTORY" --args "$APP_ARGUMENTS"