Paid Plugins + Scripts Performance Overlay

• By default, the overlay is not shown in Play Mode. Showing in play mode can be enabled with a toggle in the plugin UI (v1.0.1: this now saves properly with the plugin JSON)
• The data buffer length setting is now 2s by default, which stabilizes the fps and heap size readings compared to the previous default value 0.1s
• Keybindings actions PerformanceOverlay.OpenUI and PerformanceOverlay.ToggleEnabled
• Tweaks to the UI layout
• Fixed an issue with the color picker in the plugin UI not drawing the selection rectangle correctly when the plugin was saved with a custom color

• optimizations to reduce memory overhead of the overlay itself
  • only update the overlay if the displayed value has changed since the last interval
• reduced all default decimal places by 1 (frame rate: 0, frame time: 1, heap size: 1)
• added a color picker to set the color of the overlay

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