…onfiguration (#1887)

The following functions were removed:
 - `wifi.sta.eventMonReg()`
 - `wifi.sta.eventMonStart()`
 - `wifi.sta.eventMonStop()`
 
The corresponding documentation has also been removed

This PR addresses issue #1893

#1903)

* Add event callbacks to wifi.sta.config() and wifi.ap.config() and more

Added option to register event callbacks during configuration of both
station and AP.
Added option to register event callbacks to `wifi.sta.connect()` and
`wifi.sta.disconnect()`

* Add note about event registration to wifi module documentation

Other minor changes to wifi documentation are also included

* Add more detail to documentation for wifi.sta.config()

…1985)

* Only handle errors if we have not parsed a complete object
* Fix typo which means that \n was not an ending character

* backport fix for espressif/esp-idf#631
* remove code from intermediate fix

* fix 2007 Call callback in all cases, call callback with errorcode -1 if no connection could be establioshed
* change logging from ERR to DEBUG
* make debug output more clear (hopefully)
* add handling of errors to docs, note error handling on every call instead of only in the main documentation

From what I can tell they *should* be harmless, but I'd rather we keep a
neat house in the first place.

- Move jsonsl build to regular library build rather than #include the .c file
- Provide wrappers for malloc/calloc/free to fix undefined symbol warnings.

Sjson undefined symbol fix

* Modified wifi.sta.get*config() to return AP's MAC even if bssid_set==0
* Improved documentation for wifi.sta.getapinfo, fixes #2025

Fix the SPIFFS blocksize issues

* Improve RTC timekeeping -- includes clock rate tracking
* Improved division by 1M
* Fix crash in sntp
* Disable RTC debug
* Get the offset correct
* Add comments on where the mysterious numbers came from
* Fix a crash with auto repeat mode and errors on repeat

Unaligned loads are a no-no on many architectures, the ESP8266 included.

for master drop

…suspend

Comment out pmsleep and timer_suspend options in user_config.h