This should allow us to add custom fields to just about anything we want to within Snipe-IT.
Below are the commits that have been squashed together:
Initial decoupling of custom field behavior from Assets for re-use
Add new DB columns to Custom Fields and fieldsets for 'type'
WIP: trying to figure out UI for custom fields for things other than Assets, find problematic places
Real progress towards getting to where this stuff might actually work...
Fix the table-name determining code for Custom Fields
Getting it closer to where Assets at least work
Rename the trait to it's new, even better name
Solid progress on the new Trait!
WIP: HasCustomFields, still working some stuff out
Got some basics working; creating custom fields and stuff
HasCustomFields now validates and saves
Starting to yank the other boilerplate code as things start to work (!)
Got the start of defaultValuesForCustomField() working
More progress (squash me!)
Add migrations for default_values_for_custom_fields table
WIP: more towards hasCustomFields trait
Progress cleaning up the PR, fixing FIXME's
New, passing HasCustomFieldsTrait test!
Fix date formatter helper for custom fields
Fixed more FIXME's
I picked up the change that picked a point-release difference on the AWS library since that usually
works out for us (x.y.1 vs. x.y.2 - usually a good call)
