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* Allow GZIP compressed flash updates Modified the bootloader to be able to take stored updates in compressed GZIP format (i.e. the output of "gzip -9 xxx.bin") and decompress them on-the-fly to their final destination. This can work for apps and for filesystems (when used with the 2-step update option). Allow eboot to be built using -Os/2 optimizations by fixing some portions which failed when any optimizations were used. Add -Wall and use data and function sections to reduce size. Use -Os to minimize size. Remove obsolete esptool-ck calls to build a .ROM image, we don't use it. Move all uninitted variables to RAM from IRAM, allowing 8-bit access. Hook in @d-a-v and @pfalcon's uzlib port to actually do the decompression. Do not use any CRC checking which saves space. Since we have overwritten all of flash by the time we know id the CRC matches, there's nothing we could have done anyway. Adjust the Updater class to support GZIP files and not attempt to patch them. Bootloader builds to 0xd90 out of 0xfff bytes. * Add @d-a-v's patch for httpupdate https://github.com/esp8266/Arduino/pull/6820#pullrequestreview-326541014 * Update uzlib to point to pfalcon++ For now, because there are some self-test failures with @d-a-v's esp8266 branch (whose cool new features we don't actually use in eboot now) start with pfalcon's 2.9 release and add the 2 patches (clcidx to code from IRAM/RODATA, and the Windows test file renaming) needed to build and run successfully. * Add (c) notice for uzlib to README