build: Change version to 3.1.1

doc: Update version/desc for v3.1.0

doc: Update version/CHANGELOG for v3.0.1

doc: Update README and CHANGELOG for v3

chore: Clean up unity stuff, finish pointing to new repo

doc: Remove dev doc generation

Code base being deprecated soon, so not much new in dev docs

build: Readd signing key to build

doc: Update changelog for 0.5.6

doc: Update CHANGELOG for 0.5.5 release

doc: Update changelog for 0.5.4