* new infrastructure for shortcuts that supports both viewer and non-viewer areas

* removed shortcuts out of index.js and into new files

* reorganizes shortcut files into separate folder

* edits imports for the changed shortcuts file paths

* removes typo in file path

* fixes app path bug

* changes padding in viewer.html

* adds mousetrap back to viewer.html

* renames folder and shorcut function spaceBar

* passes event to the shortcut-functions

* adds source state to shortcut functions

* adds empty line after require

* fixes preventDefault error

* removes unnecessary argument e from shortcut functions