v2.3.0

1. Added BT Core v5.1 Direction Finding feature
2. Added BT Core v5.2 Standard Tx power control feature (still supporting Nordic Vendor-specific Tx power control feature)
3. Added physical, Link layer channel selection menu (Physical layer channels are used by default)
4. Added Physical layer channels info in channel window
5. Added listing supported features in the log window
6. Little UI changes