Release 3.0.0

Incompatibility warning
This release introduces backwards-incompatible changes to the public API!

SX126x

• Added receive with duty cycle (by @BarryPSmith in #84)
• Set DIO2 as RF switch by default
• Using 1-byte sync word

CC1101

• Fixed setting Tx power according to frequency (by @Guglio95 in #88)
• Various small fixes (by @Guglio95 in #90)
• Implemented OOK mode (by @Guglio95 in #93)

Morse

• Reworked Morse code encoder (by @IU5HKU in #96)

Common

• Reworked pin mapping and added support for resetting modules