WLAN beacon implementation

[BluemarkInnovations]

First PR of the WLAN Beacon implementation.

• Beacon functionality only works if also WLAN NaN is enabled (and the web interface). Needs more testing, it seems that without WLAN NaN, the module uses channel 1 and the PR doesn't work.
• Need improvement, so the module transmits also WLAN Beacon packets if the web interface is disabled.
• The Beacon update rate means that the RID information is updated with this rate. Default an AP transmits every 100 ms a Beacon packet.
• Added the probe response implementation. This is the default mechanism (probe request/response) for smartphones to detect nearby APs. Without the probe-response implementation, the user experience/update rate is horrible on most phones. With the probe response implementation and on the smartphone, WiFi scanning throttling off (Developer options, see the OpenDroneID project), performance is acceptable.

FYI @friissoren

[BluemarkInnovations]

Fixed outstanding issues

[BluemarkInnovations]

• made the wifi channel a parameter
• code clean up, some calls were not needed
• the issue/bug was that the web server did have its own default configuration values, not using the configured ones, solved in this PR
• use the random generated MAC address also for WLAN packet generation instead of the device MAC address
• added separate counters for both beacon and NaN packets

[tridge]

squashed commits