Experimental - manual annotations (#837)

* icons, partway

* redux for values

* onChange

* cancel

* annotations lifecycle for category names

* copy categorical

* edit category

* add Dataframe.withColsFrom

* render user annotations; default add/delete annotation category

* add label name to actions

* category name edit

* error checking improvements

* change schema field isUserAnnotation to writable

* always have an unassigned label; implement delete label

* implement add new label and edit label name

* label current cell selection

* fix select exact bug in crossfilter

* clean up categorical reducer

* fix tests

* remove debugging printf

* implement subset/reset for user annotations

* undo redo support for user annotations

* remove duplicate button from categories

* add modal

* remove obsolete duplicate annotation reducers

* remove old debugging printf

* connect modal to annotation create and dup

* initial full-stack wiring

* finish up end-to-end wiring

* fix existing unit tests

* fix pytests to match new schema API

* remove debugging printfs

* add label file rotation

* remove obsolete comment

* add fbs encode/decode tests

* add tests for writable annotations

* simplify code

* fix hashing bug with FBS encoding

* lint

* fix smoke tests

* improve error checking in Dataframe.withColsFrom

* add unit test for Dataframe.withColsFrom

* add unit test for Dataframe.columns and Dataframe.renameCol

* fix bug in FBS encode, add better error checks, refactor

* add FBS encode/decode test

* add clarifying comment

* clean up action type names; fix state inconsistency in crossfilter update

* change autosave timer to 2.5sec

* sort categorical metadata render order so it remains consistent

* add temporary autogenerated label for add-new-label operation

* fix hover-over label menu interference with cell highlighting

* remove debugging code

* add missing reducer cases & fix typo

* make dataframe memoize more general purpose

* add dev mode for annos

* fix error on select duplicate

* handle zero occupancy categories

* correctly maintain unclipped AND clipped world

* correctly handle zero length FBS matrix and label files

* ensure all writable categorical schema contains an unassigned category

* handle case where building occupancy stack for category with no members

* dialog for creating label, disable button if duplicate or empty

* visually separate writeable

* edit category

* fix edit category name

* remove debugging code

* fix edit annotation label

* visually define unassigned, change options

* Pull in requirements.txt from `master`

* label currently selected cells

* duplicate label

* lint

* fix pytest merge issues

* rename --label-file to --experimental-label-file

* remove debugging console log

* spelling error fix; fix bug found in PR review.

* lint

client/src/components/framework/custom-icons.js

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