Misc: fix bugs that were preventing starting a new stream after disconnecting. Known issue: this leaks a bit of memory. This also removes all OSX-specific code from the Apple example I used, as I have no intention of using this on Mac.

VoidLink/Stats/ImGuiPlots.h

@@ -24,6 +24,7 @@ struct PlotDef {
 - (instancetype _Nonnull)init NS_UNAVAILABLE;
 + (instancetype _Nonnull)new NS_UNAVAILABLE;
 
+- (void)clearData;
 - (void)observeFloat:(int)plotId value:(CFTimeInterval)value;
 - (void)observeFloatReturnMetrics:(int)plotId value:(CFTimeInterval)value plotMetrics:(PlotMetrics * _Nullable)plotMetrics;
 

VoidLink/Stats/ImGuiPlots.mm

@@ -92,4 +92,12 @@
     }
 }
 
+- (void) clearData {
+    for (int i = 0; i < PlotCount; i++) {
+        if (_plots[i].buffer) {
+            [_plots[i].buffer clear];
+        }
+    }
+}
+
 @end