allow more than one request, until lwip api rejects the call

see #2550

see #2582

separate convesions from the main source to allow test builds
extra unit to verify that both duration plain input and
spec work as intended

also fix wdt triggered when unknown symbols are encountered at the end
of duration string (e.g. 10000y)

updated duration parser with a fixed type instead of just millis
separate decimal and floating point converter as well, try to avoid
possible precision loss with microseconds use

separate branches for i2c search and init
replace optimistic waits with a status check

leave only the filename itself

see #2578

* deep sleep api without ESP class dependency
* rf + cpu light sleep for cases when deep sleep cannot be used
* generic time-based light sleep; nonos does not halt cpu,
  unlike the wakeup variant. timers also keep going, so
  this has to be used with extra care

pending some 'deferred' variant and before and after sleep actions

if data size and crc are ok, make sure to notify the caller
rework parameter injection and make sure endianess is right

auto-calibration and range are both a setting and a build flag

see #2578

make TurnOff action select sleep mode from available settings
wifi.off and wifi.on commands in addition to existing AP & STA

overriding buttons is... problematic?
e.g. selecting LO trigger and existing hw pushbutton GPIO,
we are most likely to trigger long-click event

According to the datasheet, ADC gain bits are [11...12]

instead of unlocking everything, remember current locks
also, allow to manually change locks in terminal

instead of flagging sync-in-progress, remember existing locks and
restore after it is done with processing

schedule when >0, execute immediately otherwise

`-mD` is not an option...

`-M -MF $file` can be used together with `-E` to generate a small
makefile-like generator (does not include any compiler flags!) for the
target file so we know which files it would use during compilation

amend b5a03dac72

amend b5a03dac72

another pin provider, similar to analogpin
instead of generating events, use last serial reading (with a timeout)

events and actions are exportable, internals are not
some internal classes that do not need init through ctor

and double-check that we really have magnitudes available
fix #2572

also queue fallback check instead of resolving it in the timer
resolve #2571

early init plus simple state switch w/ api

* dynamic relays should not overlap with configuration
* prefer explicit relay configuration vs. dynamic addition

resolve #2568