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This change 'fixes' #142. The underlying change that 'broke' the AP mode was enabling the Async WiFi scan. This has the inadvertent effect of tying up an additional 4K of RAM because the web request is hanging around for a longer period.
This reverts that change and goes back to the polling method, not quite as nice but at least it works.
Will revisit the ASync WiFi scan if/when ASyncWebserver is a bit more memory friendly.
I also enabled a small optimisation for keeping debug messages in flash now the support for this is stable.