Change ESP32 core version. Change ZED config method for new ZED-F9R firmware.

[nseidle]

Note: If you are currently using version 1.x firmware you will need to load v2.x firmware using a USB connection (SD and WiFi are not supported). We have created a Windows GUI to ease this process. Please see Updating Firmware from GUI for a step by step process. Once you've updated to v2.x firmware, you will be able to load future firmware using any method (SD, WiFi, USB, or GUI).

Changes in this release:

• (Bug fix Log file corruption #345) Decrease UART FIFO to avoid buffer overruns
• (Bug fix GNSS Failed : ZED-F9R firmware 1.30 incompatible.  #351) Change to KeyID configuration method of ZED-F9x, away from deprecated UBX-CFG-*. This enables newer ZED-F9x firmware to be configured.
• (Bug fix Connection problems in sending corrections rtcm wifi and bluetooth connection to SWmaps simultaneously. #334) Revert ESP32 Arduino core from v2.0.4 to v2.0.2 to increase free heap
• (Feature Present list of base coordinates during AP Config #327) Add Commonly Used Coordinates to AP config page for ECEF and Geodetic input
• (Feature Add Device Id to WiFi Config Page Header (last 4 of BT Mac?) #341) Add Bluetooth MAC Device ID to AP Config page and log header
• (Feature Choose rover or base mode in Ap Config and reset. #335) Add ability to change between Rover/Base from AP Config page
• (Feature Provide WiFi AP and Serial Menu function to open a new log file with new filename based on current time #344) Add ability to start new log from AP Config page and Logging Serial Menu