Folder structure for sequence and regimen lists

[roryaronson]

Some other technicals:

• Search function should also search folder names
• Folders without any matching items should not be shown in search results
• When searching, folders should be opened to display the matching items
• Folder open/closed state should be reset upon page reload, but maintained during an app session
• Folders can be nested up to... 3 levels deep?
• Folders can only be deleted if empty
• All items in the list have a user-customizable ordering
• New folders and new sequences are added to the bottom of the list

[RickCarlino]

First Release

• [x] When a sequence's 3-dot menu is open, mousing off the sequence should not hide the 3-dot icon (which causes the menu to shift)
• [x] There needs to be way to move a sequence out of all folders (into the top level)
• [x] The first click on a folder chevron doesn't work. Subsequent clicks work
• [x] Clicking into the folder name field should not open/close the folder
• [x] Change the (+/-) button to open/close all folders to white right/down chevron icons to match the folder chevrons
• [x] Give folder chevrons a little more left/right space (3em width instead of 2em looks good to me) Folder names and other things will need to move over to keep spacings consistent and stuff nicely aligned
• [x] Increase selected sequence left border to 4px and prevent this from pushing the saucer and name to the right
• [x] Remove the white border around the currently selected color in both folder color pickers and sequence/regimen color pickers (it is redundant and doesn't look quite right for folders)
• [x] Add margin back to the left of the sequence search bar
• [x] Button cluster next to sequence search bar should have bottom button edges aligned with the bottom of the search bar
• [x] Remove the Sequences help tooltip (it doesn't offer any value)
• [x] Change "CLICK TO MOVE HERE" to "Move into [folder name]"
• [x] Padding on .folder-list-item should be removed and instead added to child elements so that click targets for the chevron, color picker, and 3-dot menu are maxed out within the parent.
• [x] When clicking the move sequence button and going into the "move mode", clicking the arrows icon again should get the user out of the move mode. Maybe change the icon to a cancel icon?
• [x] Add a :heavy_check_mark: icon to the right of the edit folder name field allowing users to commit changes without clicking somewhere random
• [x] Allow changing of sequence color from the saucer in the list item
• [x] Dragging and Dropping Sequences between folders
• [x] Drop zone highlight between folders and sequences

Second Release

• [ ] Customizable folder/sequence ordering
• [ ] Dragging and Dropping folders between folders

In Progress

• [ ] If a sequence inside a folder matches the search term (but the folder itself is not a match), all sequences in that folder are being shown when only the sequence matches should be shown
• [ ] Copying a sequence should make the copy directly below the original (rather than at the bottom of the folder)