gitignore: ignore the default SPM build directory

SPM: use static libraries for the time being

GHA: update codecov action to v3

GHA: remove `gha-setup-vsdevenv`

Cassowary: finalise classes

SPI: add .spi.yml

Cassowary: improve some documentation coverage

GHA: upgrade the checkout action

Update build.yml

Update coverage.yml

Fix for intermittent failure for multi term expressions. The cause is Dictionary is not Ordered and Terms must be evaluated in insertion order.

Update build.yml

Update build.yml

Update build.yml

Update coverage.yml