- general conversion from .ino modules into a separate .cpp files
- clean-up internal headers, place libraries into .h. guard .cpp with _SUPPORT flags 
- fix some instances of shared variables instead of public methods
- tweak build system to still build a single source file via os environment variable ESPURNA_BUILD_SINGLE_SOURCE

* Config: remove prototypes.h

* fixup order

* word

* add missing

* fix warning while still using .ino

* bad at c/p;

* Test: check core feature build

* order

* add missing

* webui: improve updater error message

* ota: properly check updater state and finalize on errors

* finish up ota handling refactor

* fail web upgrade when cannot find magic byte

* send updater status with no payload arg and always send payload with

* mention magic byte and flash mode in webui

* gzip magic

* make async ota at least usable. timeouts, show errors, try harder to find data after headers

* simplify setup and destruction

* cleanup class instantiations for ota and url

* handle default case of magicflashchipsize

* shorter

* blobs