Update licensing information
Update `sce` script and move files to either `scripts` or `sources` folder
Separate code into packages and update launcher script
Update core handler to return a boolean stating if the key was handled
Enhance and update the basic handler

* Update in-line with core handler to return a boolean.
* Extract handler execution into a separate method.
* Add support for "special" keys.
Re-enable support for "strange" keys (non UTF-8, control, special, etc.)
Add support in core shell for highlights
Minor fixup
Refactor `load_file_lines` command
Minor update
Minor function rename
Rename package `sce` to `editor` (and afferent files)
Add initial pager prototype (duplicate scroll and view) from editor
Move editor scroll to common package (and minor refactorings)
Merge highlights code from pager view into the common view