factored out classes, config options in gstlal_feature_extractor exec to separate feature_extractor.py for maintainability, cleaned up import namespace

gstlal_feature_extractor + fxtools/utils.py: add option for switching between etg and timeseries pipeline modes easily, add feature queues and disk writing abilities that handle both independently

Makefile_offline_tutorial_test: tweak data gps ranges so that input data to gstlal_inspiral jobs do not crash

inspiral_extrinsics.py: fix undefined class issues in TimePhaseSNR doctests, allow pytest to run doctests on inspiral_extrinsics.py for CI

horizonhistory.py: fix issues with failing doctests, update .gitlab-ci.yml with doctests to skip in gstlal-inspiral

datasource.py: fixed whitespace issue for doctest in injection_dict_from_channel_list_with_node_range

fix more doctests in datasource.py, update .gitlab-ci.yml with more python files to ignore doctests for

gstlal_fake_frames: fix frame output so that output directory names are consistent based on LDG standards

add online feature extractor Makefile, update gstlal_feature_extractor_pipe_online to allow for connections to UWM O2 replay to occur

gitlab-ci.yml: remove condition that allows gstlal-burst build failure since it is working properly now

lal_transferfunction:  Apply resampling and smoothing of transfer functions before matrix manipulations and before making FIR filters.

gstlal_feature_extractor + utils.py: added functionality to increase the sample rate of features being produced above 1 Hz