Create inventory list

[perryr16]

Inventory list part 1

• adds AgGrid libraries
• creates inventory service for inventory list grid endpoints
• fetches org user settings (added to currentUser) and loads inventory with last used config (cycle, profile, filters, sorts)
• divides inventory list into modular components
• implements some actions (select all, select none, delete)
• base for a custom cell menu. At the moment I haven't had any luck with this but leaving in as a reference for future development
• adds a list of removable chips for filters and sorts
• there are number of placeholder functions for future features like "Only show populated columns"

Does not include

• label filtering
• majority of 'actions'
• filter groups
• nested taxlots & properties via [+] icon
• custom cell header menu

Testing

In order for this branch to function, the backend must be running branch angular/v4/build_ag_filters

[crutan]

I promise to stop complaining about how complex column mapping is. This is a ton of work - and while I do not understand it all - it all appears to work based on my limited testing.