Fix the VDD pin type for the PIC16F83 and PIC16F84. (from Bidirection…

Created by: RTrioux

…al to Power pin)

Fix the pin type for VDD in MCU_Microchip_PIC16.lib (Some VDD pins were stated as 'bidirectionals' whereas a VDD pin should be stated as a 'power pin') Moreover according to the datasheet these pins are unidirectionals

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