Added Wemos TTGO XI support

LED_BUILTIN pin is 12 instead of 13.
Reported by @cyzen and solved by @dwillmore .

SoftwareSerial@32Mhz & FastIO

• There are now delay tables for SoftwareSerial @ 32Mhz
• Fixed tables for 16Mhz
• Added FastIO to the core (Copy & paste from a newer but less Arduino compatible Larduino_HSP version)

Differential Amplifier Library

Developed API for the Differential Amplifier as a library.
Added two examples of the new library

More clock speeds, automatic clock prescaler & nice menus

• Added 1/2/4/8/16/32Mhz
• Clocks with automatic prescaling. (Same code works at all speeds)
• Nicer menus

First version. Same as LArduino

Core is the same as https://github.com/Edragon/LGT/tree/master/HSP%20Patch%20File/Larduino_HSP_3.6c/Larduino_HSP_v3.6c but can be added via 3rd party board urls