This is an attempt at replicating the non standard _getch function for windows from conio.h on linux
It should work mostly the same as the windows function.
For special keys you need to call _getch twice. The first time it will return either a 0 or 0xE0 (224) depending on the key pressed.
See https://docs.microsoft.com/en-us/cpp/c-runtime-library/reference/getch-getwch?view=msvc-160#remarks
Difference is that _getch will read CTRL+C, or any control characters.
There is also an extra function int cinPeek() that returns the next character in stdin without removing it.
Make sure that the user calling the function is in the group "input"
Only tested on Gentoo with XTerm and /dev/tty?.