* Update regrass.cpp

* Update regrass.lua

* Update regrass.rst

* Rename plants.cpp to plant.cpp

* Rename plants.rst to plant.rst

* Update plugins/CMakeLists.txt

* Update plant.cpp

* Create plant.lua

* Update plant.rst

* Add option to force plant create on no_grow; allow more valid tiles

* Update plant.cpp: remove extra includes, use if/else for plant vectors

* Update regrass.cpp: don't remove mud

* Update changelog.txt

* Update Removed.rst

* Update regrass.rst

* Update plant.rst

* Update plant.cpp

* Update plant.rst

* Add "plant list" and "regrass --list" to replace clunky commands

* Update Tags.rst: Add grass to "plants" tag description

* Update regrass.rst

* Update plant.rst

* Update plant.lua

* Update plant.cpp

* Update changelog.txt