AdjustableDelay example in echo.cpp

- added variant with AreInputsComplex parameter

for even bits_per_symbol

switched red with blue for edges

into HTML shape with HTML-like labels

ALSA support final

See merge request dspe/DSPElib!5

# Conflicts:
#   .vscode/c_cpp_properties.json
#   src/cpp/ALSA_support.cpp
#   src/cpp/WMM_support.cpp
#   src/include/ALSA_support.h
#   src/include/DSP_types.h

Signed-off-by: Damian Karaś <s176030@student.pg.edu.pl>

Signed-off-by: Damian Karaś <s176030@student.pg.edu.pl>

Signed-off-by: Damian Karaś <s176030@student.pg.edu.pl>

alsa support recording algorithm

See merge request dspe/DSPElib!4