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Reverse search through Ctrl+R, closes #206

This PR adds the ability to do reverse search in the ABS shell.
It works a little bit differently than the regular bash reverse search
as it's not multi-line.

Start typing the string you want to search for, then type ctrl + R:
Abs will show you the closes command that matches that search in the
history. At every Ctrl + R, ABS will go back and look for an older
matching command in the history.

2 of 2 new or added lines in 1 file covered. (100.0%)

2647 of 3734 relevant lines covered (70.89%)

82.71 hits per line