* Change argument to Esp.deepSleep from uint32 to uint64 to match SDK, add deepSleepMax based on the cali_proc function per SDK
* SPISlave.end() added
* Nameoftherose patch for Issue #2435 (#4256)
* WiFiTelnetToSerial Example - Minor Issues #2435
* WiFiTelnetToSerial Example - Minor Issues #2435
Patch to rectify issue #2435
* Check that pins needed by Wire are defined at compile-time (#4261)
Use platform.local.txt to add -Werror to GCC for the build of all
code. Any warnings on a submitted patch will cause an error.
Several examples and libraries had warnings/errors (missing returns
on functions, types, etc.). Clean those up with this commit as well.
