IDK what the actual problem is.
The ncurses/scanner_curses.cpp example runs fine, but it isn't as promiscuous as expected.

My hunch is that the example runs too fast, but I cannot verify it.

- Catch signals lower than 64dBm by calling available. Only works if an actual payload was received.

use more pipes in C++ curses scanner

- show noise ratio of channel out of total passes on spectrum
- spelling fixes and rename a couple functions

- supports 2 types of displays (& optional Serial debugginng)

1. SPI display (uses same bus as radio) is tested with an ST7789 (https://www.adafruit.com/product/4383)
2. I2C display is tested with SSd1306 (https://www.adafruit.com/product/326)

Use defines to toggle debugging and EITHER (not both) of the displays.

- added intro comments
- use structs for caching channel history/results in ncurses examples (py & cpp)
- fixed gitignore about changes staged for sub-folders of examples_linux
- moved cmake script into relevant CMakeLists.txt
- fix dead link in text-based scanner examples' intro comment
- use a fixed width for summary printed at ncurses example exit (& fix percent calculation)

missed this one

…decay

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