VLCplaybackController: rename backward and forward to next and previous

Sources/VLCMiniPlaybackView.m

@@ -149,7 +149,7 @@
 
 - (void)previousAction:(id)sender
 {
-    [[VLCPlaybackController sharedInstance] backward];
+    [[VLCPlaybackController sharedInstance] previous];
 }
 
 - (void)playPauseAction:(id)sender
@@ -177,7 +177,7 @@
 
 - (void)nextAction:(id)sender
 {
-    [[VLCPlaybackController sharedInstance] forward];
+    [[VLCPlaybackController sharedInstance] next];
 }
 
 - (void)pushFullPlaybackView:(id)sender

Sources/VLCMovieViewController.m

@@ -1022,14 +1022,13 @@ currentMediaHasTrackToChooseFrom:(BOOL)currentMediaHasTrackToChooseFrom
 - (IBAction)forward:(id)sender
 {
     LOCKCHECK;
-    [_vpc forward];
+    [_vpc next];
 }
 
 - (IBAction)backward:(id)sender
 {
     LOCKCHECK;
-
-    [_vpc backward];
+    [_vpc previous];
 }
 
 - (IBAction)switchTrack:(id)sender

Sources/VLCPlaybackController.h

@@ -79,8 +79,8 @@ currentMediaHasTrackToChooseFrom:(BOOL)currentMediaHasTrackToChooseFrom
 - (void)startPlayback;
 - (void)stopPlayback;
 - (void)playPause;
-- (void)forward;
-- (void)backward;
+- (void)next;
+- (void)previous;
 - (void)switchAspectRatio;
 - (BOOL)updateViewpoint:(CGFloat)yaw pitch:(CGFloat)pitch roll:(CGFloat)roll fov:(CGFloat)fov absolute:(BOOL)absolute;
 - (NSInteger)currentMediaProjection;

Sources/VLCPlaybackController.m

@@ -540,7 +540,7 @@ VLCMediaDelegate, VLCRemoteControlServiceDelegate>
     }
 }
 
-- (void)forward
+- (void)next
 {
     NSInteger mediaListCount = _mediaList.count;
 
@@ -578,7 +578,7 @@ VLCMediaDelegate, VLCRemoteControlServiceDelegate>
     }
 }
 
-- (void)backward
+- (void)previous
 {
     if (_mediaList.count > 1) {
         [_listPlayer previous];

Sources/VLCWatchCommunication.m

@@ -98,9 +98,9 @@ static VLCWatchCommunication *_singeltonInstance = nil;
         [[VLCPlaybackController sharedInstance] playPause];
         responseDict = @{@"playing": @([VLCPlaybackController sharedInstance].isPlaying)};
     } else if ([name isEqualToString:VLCWatchMessageNameSkipForward]) {
-        [[VLCPlaybackController sharedInstance] forward];
+        [[VLCPlaybackController sharedInstance] next];
     } else if ([name isEqualToString:VLCWatchMessageNameSkipBackward]) {
-        [[VLCPlaybackController sharedInstance] backward];
+        [[VLCPlaybackController sharedInstance] previous];
     } else if ([name isEqualToString:VLCWatchMessageNamePlayFile]) {
         [self playFileFromWatch:message];
     } else if ([name isEqualToString:VLCWatchMessageNameSetVolume]) {