Automatically embed a CRC32 of the program memory (including bootloader
but excluding any filesystems) in all images in unused space in the
bootloader block.

Add a call, ESP.checkFlashCRC() which returns false if the calculated
CRC doesn't match the one stored in the image (i.e. flash corruption).

Fixes esp8266#4165

Show CRC checking catch a 1-bit error in program code by corrupting a
large array, and then return it to clean and verify the CRC matches once
again.

Add comments to the CRC check routine

Clean up pylint complaints on crc32bin.py

Add an assertion in the eboot linker file to guarantee that we have at
least 8 bytes of unused space at the end of the boot sector to patch in
the CRC.  If not, the eboot link will fail.

Per discussion with @d-a-v.

When the CRC check fails, you could *try* to do certain things (but may
not succeed since there is known flash corruption at that point).  List
a few ideas for application authors.

Per discussion w/@mcspr, combine the CRC calculation with the binary
generation, removing the additional build step.