* Implemented edit selection buffer

* Added checks and changed keybind

* Forgot check and style fixes

* Don't work late at night again

You forget things when you're tired

allow multiple make targets being specified at once

do build configuration with variables instead of targets

This reverts commit e226e8c889.

- distinct keybinds for single entry, range or all selection
- selecting a file/range/all files would turn selection mode on
- single file/range or all selection appends to selection
- any operation (cp, mv, rm, plugin/file execution, cmd prompt, launch app, spawn
  shell) on selection ends the selection mode
- selection buffer is cleared after mv, rm on selection
- repeat range selection on same file clears selection and exits seleciton mode
- basic check (won't work on dir reload) added to avoid duplicates in selection