mac/menu: pre-fill mpv and system information when creating an issue

when opening a new issue from the menu bar when can easily pre-fill the
mpv and system information since they are easily available in our code.

Author: Akemi

osdep/mac/info_helper.swift

@@ -16,6 +16,40 @@
  */
 
 class InfoHelper {
+    static var version: String {
+        return """
+            \(mpvVersion) \(mpvCopyright)
+
+            """ +
+            (mpvBuilddate == "UNKNOWN" ? "" : " built on \(mpvBuilddate)\n") +
+            """
+            libplacebo version: \(libplaceboVersion)
+            FFmpeg version: \(ffmpegVersion)
+            FFmpeg library versions:
+               libavcodec      \(libavcodecVersion)
+
+            """ +
+            (libavdeviceVersion == nil ? "" : "   libavdevice     \(libavdeviceVersion ?? "")\n") +
+            """
+               libavfilter     \(libavfilterVersion)
+               libavformat     \(libavformatVersion)
+               libavutil       \(libavutilVersion)
+               libswresample   \(libswresampleVersion)
+               libswscale      \(libswscaleVersion)
+            """
+    }
+
+    static var system: String {
+        return """
+            - macOS version: \(systemVersion)
+            - Source of mpv:
+            - Latest known working version:
+            - Issue started after the following happened:
+            """
+    }
+
+    static var systemVersion: String { return ProcessInfo.processInfo.operatingSystemVersionString.replacing("Version ", with: "") }
+
     static var mpvVersion: String { return String(cString: swift_mpv_version) }
     static var mpvCopyright: String { return String(cString: swift_mpv_copyright) }
     static var mpvBuilddate: String { return String(cString: swift_mpv_builddate) }

osdep/mac/menu_bar.swift

@@ -238,7 +238,12 @@ class MenuBar: NSObject, EventSubscriber {
             Config(name: "Release Notes…", action: #selector(url(_:)), target: self, url: "https://github.com/mpv-player/mpv/blob/master/RELEASE_NOTES"),
             Config(name: "Keyboard Shortcuts…", action: #selector(url(_:)), target: self, url: "https://github.com/mpv-player/mpv/blob/master/etc/input.conf"),
             Config(type: .separator),
-            Config(name: "Report Issue…", action: #selector(url(_:)), target: self, url: "https://github.com/mpv-player/mpv/issues/new/choose")
+            Config(name: "Report Issue…", action: #selector(url(_:)),
+                   target: self,
+                   url: "https://github.com/mpv-player/mpv/issues/new?template=2_bug_report_macos.yml" +
+                        "&mpv_info=" + (InfoHelper.version.addingPercentEncoding(withAllowedCharacters: .urlHostAllowed) ?? "") +
+                        "&other_info=" + (InfoHelper.system.addingPercentEncoding(withAllowedCharacters: .urlHostAllowed) ?? "")
+            )
         ]
         if AppHub.shared.isBundle {
             helpMenuConfigs += [