Add data and meter uploads via spreadsheet

[perryr16]

Whats in the PR

There's a lot of changes in this PR. The primary features include the Dataset page, and the xls data upload flow.

Dataset(s) pages

• data pairing not yet hooked up

Spreadsheet data uploads

• file select upload modal
• data mapping 'stepper' screens (stepper is an angular material component, similar to a wizard).
• meter uploads from dataset or after import
• Not yet hooked up: geojson, buildingsync files
• properties and taxlots
• multicycle
• column list profiles to map incoming data to seed data
• editable cells to select seed header, data type, and untis

Various other fixes & improvements

Testing

• upload various property and taxlot spreadsheets
• upload meters after upload
• upload meters from datasets

Screenshots

Datasets

Property/TaxLot Upload

Meters

[kflemin]

looks great!