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

server/data/db.json

@@ -111,7 +111,7 @@
     "title": "All about Carlos demo event",
     "url": "www.carlosvalente.com",
     "publicInfo": "WiFi: demoproject \nPassword: ontimeproject",
-    "backstageInfo": "WiFi: demobackstage\nPassword: ontimeproject"
+    "backstageInfo": "WiFi: demobackstage\nPassword: ontimeproject",
     "endMessage": ""
   },
   "settings": {