Small importer improvements, added larger CSV samples

[snipe]

This updates the example CSVs with additional support fields, and in some cases includes a -large version which will supply 1000 example records. As always, these do not work the same as the seeders, as the seeders have been carefully crafted to create realistic looking data, while the CSVs are meant to generate more data, so it's not always going to be realistic based off of the available types of object mocks Mockaroo offers.

The goal for the -large versions is to be able to generate a LOT of data on an import so that we can check for things like 1001 queries.

The schemas are available here:

• Categories: https://www.mockaroo.com/e3ea6390
• Components: https://www.mockaroo.com/54a10160
• Consumables: https://www.mockaroo.com/09a88e20
• Manufacturers: https://www.mockaroo.com/025dca10
• Models: https://www.mockaroo.com/d7394640
• Suppliers: https://www.mockaroo.com/a689b800

I know Mockaroo can support some clever linking in their generated datasets, so it's possible that we might be able to use this for users, assets, etc - things that are a bit more complicated since they rely on other data to exist.

@uberbrady - don't panic at the lines changed :D It's just the large CSVs.

I've also added a few lines in the importer that strip the whitespace from headers. We ran into an issue where a user was having a problem because their headers were Model Name instead of Model Name, etc. Hopefully this sorts them out.