Feat/excel (#45)

* add dependency

adding dependency to parse the excel file in the node side

* import file

ability to import file
- add extension
- safeguard file type and size

* user is able to upload json or excel

* chore: extract logic into self contained function

* associate model with version

* test id generation

* parse excel data

* prevent UI crash on bad data

* extract validation into self contained function

* chore: add more tests for bad data

* config: stop from opening browser on start

* fix comma in sample db

* handle corrupt files

* error boundary around main components

* jsdocs

* increase id length

* parse excel time string

* feat: excel parsing

* validate json db before import

* chore: test event validator

* feat: make function to clean convert strings

* chore: test parser

* chore: jsdocs

* fix: bug on upload

prevent bug where the component would prevent upload of same file twice

client/src/app/api/ontimeApi.js

@@ -47,7 +47,7 @@ export const downloadEvents = async () => {
 
 export const uploadEvents = async (file) => {
   const formData = new FormData();
-  formData.append('jsondb', file); // appending file
+  formData.append('userFile', file); // appending file
   await axios
     .post(ontimeURL + '/db', formData, {
       headers: {