This is a quick fix for #197

Simple Menu

See merge request !433

long press was fixed to about 1-2 seconds, based on the time in seconds when the button was pressed,
now it's a variable in milliseconds with 1000 ms as default

See merge request !431

Pycardium gets a bit smaller now: 384 kb

added hyperlink to l0dables/blinky

See merge request !430

Fixed documentation of circle

See merge request !429

Environmental Sensing Service

See merge request !428

BHI160 cleanup

See merge request !423

While subscribed to an ESS characteristic, the sensor gets polled
every 3 seconds.

This makes the behaviour of the BME680 more predictable when measuring
in an irregular interval.

This allows to execute code which uses mutexes before the scheduler is
started. E.g. during early hardware init.