Buzzer, Double click to label, Edit Pin, Edit Slider value, Java 10, fixes and optimizations

• Compiled with Java 10
• Double click using Edit Tool to label a component
• Finally added the Buzzer (I/O library)!
• Right click on Pin, Edit Contents and enter the decimal value you want to set
• I/O Slider, Value attribute
• Graphics paint refresh rate was set at 20Hz, now is 60Hz by default and you can change it in Preferences/Window
• Shift Register will show its internal bits even when set to serial load
• A lot of bug fixes, optimizations and small changes