Update side_ch scripts for this discussion:
https://github.com/open-sdr/openwifi/discussions/344

Add waterfall to side_info_display.py:
1. While want to show waterfall, it must be added as the 3rd argument which means the 2nd argument num_eq (by default 8) has to be input!
2. Change the waterfal

Add waterfall to side_info_display.py:
1. While want to show waterfall, it must be added as the 3rd argument which means the 2nd argument num_eq (by default 8) has to be input!
2. Change the waterfall colormap: from fixed to dynamic in side_info_display.py
3. Remove periodical print for performance consideration.

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Displaying side channel plots with interactive mode to avoid jumping to foreground on update
Plus small fix for file closing

improve the matlab script of iq capture:

1. more flexible
2. align the rx iq to the new hardware: natural order: lsb 16bit for I; msb 16bit for Q

Add value print only option to side_ch_ctl.c:
When two arguments are input (no matter the exact value/form of the 2nd input), the side_ch_ctl will print value only to ease some bash script to call/us

Add value print only option to side_ch_ctl.c:
When two arguments are input (no matter the exact value/form of the 2nd input), the side_ch_ctl will print value only to ease some bash script to call/use further (avoid extra parsing while extra info present)

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Add openwifi CSI radar app note

Improve the IQ sample Matlab script
For displaying and saving I/Q sample captured by openwifi side channel feature

Fix various typos

Found via codespell v2.1.dev0
`codespell -q 3 -L ans,filp,fils,hsi`

Update side_ch_ctl.c

adding license and copyright headers

sync internal

iq capture feature

the side channel (timestamp, frequency offset, CSI, equalizer) feature