* emon: configure ratios without reboot
* settings: serialize() support
* debug: use vsnprintf from newlib, not from sdk
* settings/experimental: show defaults via `get`
* emon: override base methods, fix defaults
* sensor/emon: expose internal index calculation
- refactor configuration to use the correct index when accessing indexed
sensor methods. store index value on magnitude, refactor loops to
accomodate this new functionality
- rename slot(index) -> description(index), since we use 'slot' as
numeric value
- 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
- Update sensor classes to support a generic way to store energy values
- Update sensor conversion code to deal with units and not magnitudes
- Add magnitude<->unit for sensors, generic way of defining used unit. Convert from sensor magnitude unit to the one used for display.
- Reset energy value based on index through external means (MQTT, HTTP)
- Rework energy timestamping, update webui with 'last saved' value
While this solves the energy conversion issues and we are finally seeing the real value, what I don't really like:
- KilowattHour and WattHour are separate enum tags, thus sort-of are different types altogether
- Conversion code in Energy object should probably use some generic 'ratio' calculation? (https://en.cppreference.com/w/cpp/numeric/ratio/ratio)
- We are still using runtime checks to do calculations and depend that sensor outputs only one specific value type.
Consider this a fix for energy display / storage and preliminary work on sensor.ino
Further sensor refactoring... soon.
Max Prokhorov
Xose Pérez
gn0st1c