rustdoc

to do

add output variables from open_file() to switch working file
create left panel with explorer
add dialog to choose folder and remember folder
- use the directories crate to access a platform-agnostic cache
- to do this, I will need to add a fn startup() that runs at when launched that checks for a folder or opens a dialogue to open or create one in a default location
separate working_dir and explorer_dir so that the explorer expands from root dir instead of only showing the clicked folder
- it is difficult to implement this because there are difficulties with managing which directory to write to without messing up the display_explorer function
add match case for how to handle different files and folders in explorer
add case for if the add file is in the working directory (if needed)
make add file / add folder remember the path used last time
add drag and drop support, including into the relavent folders in the explorer