Update 4.5.0

[Si443x] Fixed preamble configuration (#199)
[PHY] Fixed negative random numbers (#328)
[Si443x] Fixed direct mode modulation (#319)
[LLCC68] Added support for LLCC68 param range checks (#314)
[Si443x] Fixed modulation config (#313)
[SX126x] Added interrupt-driven ping pong example (#260)
[PHY] Added direct reception support
[LLCC68] Added support for LLCC68
[SX128x] Added support for changing LoRa sync word (#311)