Automatically resize the loadout notes textarea

[insin]

Proposed change

It's difficult to add and edit detailed loadout notes as only the first line of the <textarea> is visible. Automatically resizing the notes textarea would make it easier.

I already have a proof of concept working here, but would need to talk about how a final version should work (e.g. should there be a max height? does it need to behave differently on desktop and mobile?):

https://github.com/DestinyItemManager/DIM/compare/master...insin:DIM:autosize-loadout-notes-textarea?expand=1

How does this fit into your workflow?

I like to write detailed notes about how a loadout works and how you should use it when creating loadouts to share, this would make it easier to write and edit the notes directly in DIM.

[bhollis]

Sure, that'd be nice, with a max height.