NavEntry.svelte
1. Create New entry: Separate amountTxt and amountValue. Use amountValue when ever necessary instead of changing text.
2. Use this number formatter for currency input
     https://stackoverflow.com/questions/24163889/html5-input-for-money-currency
3. Disable the Create Button when all the inputs are not valid
4. Schedule Formula Select remove the border after the item is selected
5. Weird alignment of split entry values https://ibb.co/vVQ9MKy
6. Get rid of $: where ever not necessary
7. When the amount does not split properly the last month should have the difference. e.g 100 is split to three months as 33.33, 33.33, 33.34
8. validateEntry should also check if enddate is after startdate and amount totals match