TinyTX4

Upgrades from TinyTX3:

Updated to RFM69HW/W module
Updated to ATtiny1614 SOIC
Added optional MCP1700|MCP1703 regulator for ~~4-6V~~ input ultra low dropout or ~4-16V input range (e.g. 9V battery, Lead Acid cells...). These can be bought in 3.3V or 5V out
Added programming header with UPDI
Labelled RX/TX ports for hardware UART
Added ground planes to improved antenna performance
Added optional SMA PCB for improved antenna performance

The monopole version keeps the same overall dimensions of TinyTX3.

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