Implemented minimum and maximum gap times in addition to current
gap/pulse ratio. Changed values to be independent of sample rate.
Also made bitbuffer less noisy for decoders with small .long_limit
Tested with:
rtl_433_tests/tests/ambient_weather/01/f007th.data
rtl_433_tests/tests/cardin/01/S466-TX2_01.data
rtl_433_tests/tests/cardin/01/S466-TX2_02.data
rtl_433_tests/tests/fineoffset/01/gfile001.data
rtl_433_tests/tests/lacrosse/01/gfile001.data
rtl_433_tests/tests/lacrosse/01/gfile002.data
rtl_433_tests/tests/lacrosse/01/gfile006.data
rtl_433_tests/tests/oregon_scientific/01/BTHGN129.data
rtl_433_tests/tests/oregon_scientific/01/BTHR968.data
rtl_433_tests/tests/oregon_scientific/02/gfile003.data
rtl_433_tests/tests/prologue/01/gfile001.data
Initial attempt at making CPU efficient demodulation by making a common
data sample processing. The CPU intensive sample based demodulation will
be replaced by a common pulse detector outputting a pulse data structure
for further processing.
