Add terminal key input to manpage

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.Nm

supports filelists, various image sorting modes, image captions, HTTP and more.

Configurable keyboard and mouse shortcuts are used to control it.

It can be controlled by configurable keyboard and mouse shortcuts, terminal

input and signals.

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.Pp

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.Sh KEYS

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In an image window, the following keys may be used

.Pq The strings in Bo square brackets Bc are the config action names :

The following actions and default key bindings can be used in an image window.

.Pq The strings in Bo square brackets Bc are the config action names .

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If

.Nm

is running inside a terminal and its standard input is not used for images or

filelists, key input from the terminal is also accepted. However, terminal

input support is currently limited to most alphanumeric characters

.Pq 0-9 a-z A-Z and some more ,

return and backspace.

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.Bl -tag -width indent

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