reorg shortcuts, rm unused bindings
reorg shortcuts, rm unused bindings

- rm useless bindings
  - rm tab-related bindings
    - because i never use them
  - rm just to next conflict marker
    - because i never use it
  - rm hexme binding
    - because i never use it
    - replace with simultaneous scroll window binding
  - rm binding for creating splits on a given side
    - because i never use it
- group toggles together

atweiden/pacfiles,atweiden/pacfiles