- clean-up comparison routines and get rid of most of the casts
- reduces total number of calls to terminalRegisterCommand
  replace with a func accepting list of commands, which in
  turn get instantiated as constexpr PROGMEM arrays
- reduce ram fragmentation, since we don't need to alloc as much
- reduce flash consumption b/c of lambda -> standalone func conversion

get rid of board module, replace with system calls for hostname, board
and password. move boot (quirks) handlers to system as well
espurna::build { ... } namespace for our app const values

make our string comparisons nicer
also clean-up namespaces for storage access

rework more namespaces to use `espurna` root
makes internal references much easier (and shorter)

view class is not specific to settings, could use it across the app
remove duplicate code from IR

- store latest pzem reading and compare with the latest one each reading
- fix `Energy::Energy(double)` scale, it should be kWh and not Wh
- move watt-second accumulator to constructor, allow object addition

ignore energy reset on boot with pzem004t(v30), ref. #2530
(and continue to use its own internal energy persistance)

This *must* use views, but that's something for another day
Tweak terminal command, also allow to view the energy value

fix a bug introduced in e4b068ec7d
resolve #2528

resolves #2500
resolves #2523

- fixing default config values, make sure we take inputs into
  an account and not assume we stay in the 0.0...1.0 range
- use shelly values from tasmota analog sensor impl
- handle edgecase when both resistances are zeroed
- clearer description of available connection schemes

in theory, there is also an option of having *both* up and down
resistors at the same time; right now we simply deduce NTC position by
making it an opposite of resistance. ldrsensor implementation currently
allows to explicitly set sensor position

One namespace for sensor functions and types.
Fix discrepancy between topic and indexed topic funcs.
Energy types fixes, make sure we use known ratios.

Sensor fixes, moving certain pin settings and defaults into the sensor
classes, using those in the actual sensor init code.
Energy is still within the sensor module, pending version bump before moving.

also split energy info into a separate payload & handler

make sure we have access to magnitude formatters early in the file
more namespacing, where possible

proper support for both conversion directions
ratio object stores the scaling, no need to deduce it through the enum
name anymore

we still don't really enforce incompatible units, though,
but it is unclear at what stage the error should come in

when types are the same, handle things directly in the class base
plus, reduce the amount of explicit comparisons

address #2516, implement through ratio setting

schedule immediately with module functions, don't wait
more flash-strings in the module and utility functions

support rare condition when body cannot be sent on connect, use poll to send it
don't wait for header line in body, and bail out when done parsing
make sure data is copied into the async variant, and remains there for
the duration of the connection

general async api is... more complicated that it needs to be
until wolfssl / brssl port is here, though, there is no other choice
secureclient config becomes a simple struct, pending further rework

generalize topic and value representation
breaking change for rpn, since the magnitude *may not* be indexed

also fixes debug logs, where we would always see units of the 1st
magnitude instead of the one being processed

see #2519

make sure we use clamp instead of constrain

resolves #2501

Co-Authored-by: Maxim Prokhorov <prokhorov.max@outlook.com>

stronger time types, overrides

init underlying lib object as a member
this might be changed to unique_ptr, in case we really want begin() to
be idempotent and being able to re-init things
(which might not be actually possible?)

structure, overrides, strong time types

actually use the analog sensor base to read
(and fixing yet another pinmode accident)

fixed structure, overrides. strong time types

updated structure, overrides. strong time type
testing timesource changes. this should work, but might need to tweak
things if it starts to fail b/c of flash code loads

conversion is not working for signed ints, only unsigned

do not force to implement constructor, just update vtable
continue testing with bme280 class, update structure

Avoid confusion between ref and pointer when looping over sensors
Re-use helper class in the magnitude object as well

Remove custom code related to filter movement, just use unique_ptr
Plus, updates filter code to use stl vector where possible

Experimening with dynamic cls id. Perhaps this should be something
else... but, at least there are no longer any header-defined values.

IKEA Vindriktning Air Quality Sensor
https://www.ikea.com/gb/en/p/vindriktning-air-quality-sensor-80515910/

fixes #2491