Merge FishStatsUtils into VAST to simplify maintenance

Merge FishStatsUtils into VAST as release 4.0.0 (#397)

* merge FishStatsUtils into VAST

* try making CI happy

* more attempt to make CI happy

* fix another CI problem

* another attempt

* more fixes

* more fixes

* further cleanup

* fixing Imports

* fix another CI test

* update docs

* fix plot_factors

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Co-authored-by: Jim Thorson <James.T.Thorson@gmail.com>

Update FishStatsUtils to 2.13.2

See NEWS for details

Update to FishStatsUtils 2.13.1

See NEWS for details

Bug-fix when using SVCs without Omega+Epsilon in 2nd linear predictor

h/t Sean Anderson for identifying bug, and see NEWS for details

Update to FishStatsUtils 2.13.0

See NEWS for details.

Update to FishStatsUtils 2.12.1

Dev (#364)

* experiment to fix issue raised by Arnaud

* fix bug in rgengamma

* fix bug in project_model

* new fix to project_model

* fix typo in last commit

* further edit to fix for `project_model`

* update NEWS

* add FishStatsUtils version requirement to DESCRIPTION

3.10.0

See NEWS.pdf for list of updates

Fix bug in barrier-SPDE method

See NEWS.pdf for details, and h/t to Nicholas Ducharme-Barth for identifying the issue and suggesting a fix.

Update AFSC grids

Update dependency to FishStatsUtils release 2.11.0

Fix uninformative crash in plots using `calculate_proportions`

See NEWS for details.