Fm.awk Versions Save

The version 1.3 has improved in:

1. cmd mode now has better tab completion in path and command.
2. now selection is selected and executed in order

TODO: further improve cmd mode to allow for left and right arrow to move when the status is longer than the column dimension.

Improvement:

1. React to SIGWINCH
2. Preview function by an external script, helped by magpie514 (sample script included)
3. Fixed "go back" after search
4. Makefile improved by xgpt

Initial release for fm.awk

Functionality:

1. ueberzug support if installed, if not, chafa is the backup.
2. able to preview both pdf files and videos

TODO:

1. make preview function become individual script