* [cli] Implement the build command

* [cli] Remove all build.sh scripts

* [cli] Restore build-all.sh

* Fix the test.

* Strip custom sections

* Add some testing.

* Strip name and reloc sections as well

* [cli] handle directory already exists, display friendly errors

* [cli] rustfmt

* [cli] don't overwrite existing files

* [cli] add test

* [cli] atomic check for file exists on create

* [cli] derive From/Display impls, remove CommandErrorKind

* [ink] Fix some clippy warnings

* [lang] Major clean ups in preparation of greater refactorings