minimal & single-source builds should coexist yet again

also fixing leftover API dependency issues

sdk would silently cancel both

helper would block 2nd action, wifi is not enabled yet
fixing behaviour introduced in 28f3b7da8

also make boot action optional

also get rid of flashstringhelper

*should* fix most constexpr'ness issues when inlining
(but, now has a small overhead of template instantiation)

make dependabot happy

(redraw)

fix #2585

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