* fix DEBUG macros
All fmt strings in flash
fix#5658
This also allows to avoid warnings and easy mistakes with (no brace):
if (something)
DEBUGV("blah");
* use newlib unaligned-compatible printf for DEBUGV
* remove useless putprintf since ::printf already uses ets_putc
- auto select ssid with best signal
- for debugging enable DEBUG_WIFI_MULTI macro and call Serial.setDebugOutput(true);
change ESP8266WiFiClass::status() return type to wl_status_t