Release 3.0.0 - Bluetooth/BLE, SDK 1.5.0

Large update, focused on Bluetooth support for the Pico W

Major Updates

• Bluetooth Classic and Bluetooth Low Energy (BLE) alpha support (#1167)
• Update to SDK 1.5 (#1167)
• Use Pico-SDK CYW43 infrastructure (#1167)
• Add Bluetooth Classic HID libraries and examples (#1240)
• Add Bluetooth SPP SerialBT and examples (#1240)
• Add BLE HID libraries and examples (#1240)
• Move pico-sdk to RPI's original version (#1239)
• More aggressive WiFiMulti, targets specific APs by BSSID (#1167)

Bugfixes

• Move PicoW auto-reassignment of LED pin to code (#1208)
• Always apply 5M speed to CMSIS_DAP TCL script (#1218)
• Return custom USB product and manufacturer (#1223)