Add adjustable seek times

Make seek times adjustable. Expose seek time under Playback Settings.
Set min time allowed in seconds to 1 and max time in seconds to 300.

FEATURE: 468686

src/audiomanager.cpp

@@ -474,13 +474,13 @@ void AudioManager::seek(qint64 position)
 void AudioManager::skipForward()
 {
     qCDebug(kastsAudio) << "AudioManager::skipForward";
-    seek(std::min((position() + SKIP_STEP), duration()));
+    seek(std::min((position() + (1000 * SettingsManager::skipForward())), duration()));
 }
 
 void AudioManager::skipBackward()
 {
     qCDebug(kastsAudio) << "AudioManager::skipBackward";
-    seek(std::max((qint64)0, (position() - SKIP_STEP)));
+    seek(std::max((qint64)0, (position() - (1000 * SettingsManager::skipBackward()))));
 }
 
 bool AudioManager::canGoNext() const

src/audiomanager.h

@@ -53,7 +53,6 @@ class AudioManager : public QObject
 public:
     const double MAX_RATE = 1.0;
     const double MIN_RATE = 2.5;
-    const qint64 SKIP_STEP = 10000;
     const qint64 SKIP_TRACK_END = 15000;
 
     static AudioManager &instance()

src/qml/Settings/GeneralSettingsPage.qml

@@ -166,6 +166,40 @@ Kirigami.ScrollablePage {
                         SettingsManager.save();
                     }
                 }
+                MobileForm.FormDelegateSeparator {
+                    below: prioritizeStreaming
+                    above: skipForwardStep
+                }
+                MobileForm.FormTextDelegate {
+                    id: skipForwardStep
+                    text: i18nc("@label:spinbox", "Skip forward interval (in seconds)")
+                    trailing :
+                        Controls.SpinBox {
+                            Layout.rightMargin: Kirigami.Units.gridUnit
+                            value: SettingsManager.skipForward
+                            from: 1
+                            to: 300
+                            onValueModified: {
+                                SettingsManager.skipForward = value;
+                                SettingsManager.save();
+                            }
+                        }
+                }
+                MobileForm.FormTextDelegate {
+                    id: skipBackwardInterval
+                    text: i18nc("@label:spinbox", "Skip backward interval (in seconds)")
+                    trailing :
+                        Controls.SpinBox {
+                            Layout.rightMargin: Kirigami.Units.gridUnit
+                            value: SettingsManager.skipBackward
+                            from: 1
+                            to: 300
+                            onValueModified: {
+                                SettingsManager.skipBackward = value;
+                                SettingsManager.save();
+                            }
+                        }
+                }
             }
         }
 

src/settingsmanager.kcfg

@@ -123,6 +123,18 @@
             <label>List of user-defined playback rates</label>
             <default>50,75,100,125,150,175,200,225,250</default>
         </entry>
+        <entry name="skipForward" type="UInt">
+            <label>Skip forward in seconds</label>
+            <min>1</min>
+            <max>300</max>
+            <default>10</default>
+        </entry>
+        <entry name="skipBackward" type="UInt">
+            <label>Skip backward in seconds</label>
+            <min>1</min>
+            <max>300</max>
+            <default>10</default>
+        </entry>
     </group>
     <group name="Network">
         <entry name="allowMeteredFeedUpdates" type="Bool">