Port away from deprecated/removed APIs in mpv 2.0

Register observers as MPV_EVENT_IDLE is deprecated and
MPV_EVENT_PAUSE/MPV_EVENT_UNPAUSE have been removed.

src/mpvhandler.cpp

@@ -41,6 +41,8 @@ MpvHandler::MpvHandler(int64_t wid, QObject *parent):
     mpv_observe_property(mpv, 0, "sub-visibility", MPV_FORMAT_FLAG);
     mpv_observe_property(mpv, 0, "mute", MPV_FORMAT_FLAG);
     mpv_observe_property(mpv, 0, "core-idle", MPV_FORMAT_FLAG);
+    mpv_observe_property(mpv, 0, "idle-active", MPV_FORMAT_FLAG);
+    mpv_observe_property(mpv, 0, "pause", MPV_FORMAT_FLAG);
     mpv_observe_property(mpv, 0, "paused-for-cache", MPV_FORMAT_FLAG);
 
     // setup callback event handling
@@ -191,6 +193,31 @@ bool MpvHandler::event(QEvent *event)
                             ShowText(QString(), 0);
                     }
                 }
+                else if(QString(prop->name) == "idle-active")
+                {
+                    if(prop->format == MPV_FORMAT_FLAG)
+                    {
+                        if((bool)*(unsigned*)prop->data)
+                        {
+                            fileInfo.length = 0;
+                            setTime(0);
+                            setPlayState(Mpv::Idle);
+                        }
+                    }
+                }
+                else if(QString(prop->name) == "pause")
+                {
+                    if(prop->format == MPV_FORMAT_FLAG)
+                    {
+                        if((bool)*(unsigned*)prop->data)
+                        {
+                            setPlayState(Mpv::Paused);
+                            ShowText(QString(), 0);
+                        }
+                        else
+                            setPlayState(Mpv::Playing);
+                    }
+                }
                 else if(QString(prop->name) == "paused-for-cache")
                 {
                     if(prop->format == MPV_FORMAT_FLAG)
@@ -203,26 +230,14 @@ bool MpvHandler::event(QEvent *event)
                 }
                 break;
             }
-            case MPV_EVENT_IDLE:
-                fileInfo.length = 0;
-                setTime(0);
-                setPlayState(Mpv::Idle);
-                break;
-                // these two look like they're reversed but they aren't. the names are misleading.
+            // these two look like they're reversed but they aren't. the names are misleading.
             case MPV_EVENT_START_FILE:
                 setPlayState(Mpv::Loaded);
                 break;
             case MPV_EVENT_FILE_LOADED:
                 setPlayState(Mpv::Started);
                 LoadFileInfo();
                 SetProperties();
-            case MPV_EVENT_UNPAUSE:
-                setPlayState(Mpv::Playing);
-                break;
-            case MPV_EVENT_PAUSE:
-                setPlayState(Mpv::Paused);
-                ShowText(QString(), 0);
-                break;
             case MPV_EVENT_END_FILE:
                 if(playState == Mpv::Loaded)
                     ShowText(tr("File couldn't be opened"));