[tc_history] [tc_editline] Add multiline support

[darkuranium]

The libraries are limited to getting (and storing in history) only a single line of input. This should be added.

Some sort of an API is needed to provide support for this.

Example (in a shell):

$ echo '
foo
bar'
> foo
bar
# (( up arrow key ))
$ echo '
foo
bar'