#74 reaction on wrong key-event complicates usage

[Uwe Freese]

The standard behaviour of pressing a key (e.g. in
notepad) is:

- the character of the key can immediately be seen when
the user holds down the key
- if the key is held for >~1s, the repeat function makes
more characters appear

The behaviour in lcdplugin is:

- user holds down key and releases it
- if the time was < 250 ms (?), lcdplugin reacts *after
releasing* the key
- if the time was 250 ms...1s (?) long, *nothing happens*
- if the time is > 1s long, it does repeatedly do the
function

It seems to me that the wrong key-events are used.
It is a little bit bothering to hold down the key for the
correct time.