Add topological sort function to utils
Resolve variable dependencies when exporting
Remove add group button from main header
Update console debug logging
Update verb conjucation rules
Make preview buttons wrap
Re-add verb past tense rule for verbs ending in y

Not sure if all regular verbs ending in y (like "apply") can be
conjugated to end with "ied" ("applied") in the past tense, but it
appears to work for all the words I've tested.
Add FileSaver library (for universal saveAs() support)
Add download button to export dialogs
Implement export as node executable
Add exported module usage previews