Before this change if logs were not redirected, logging would
corrupt the terminal screen.
This commit stores the logs (max ~100 lines) in an array and
print them when the program exits.
The previous version used values after the maximum Unicode code-point
to encode a key. This could lead to an overflow since a key is a int16,
a rune is int32 and the maximum Unicode code-point is larger than int16.
A better solution is to simply use negative runes for keys.
The https://github.com/nsf/termbox-go library is no longer maintained
so this change replaces it with the maintained
github.com/gdamore/tcell library which has a termbox backwards
compatibility layer.
There are a few minor changes from the termbox library:
- Using Clear with fg bg ColorDefault resulted in a white background for some reason.
- Clear with fg ColorWhite bg ColorBlack was used instead.
- tcell's termbox wrapper doesn't support ColorLightYellow.
- ColorYellow + 8 was used instead.
eNV25