Add text on the microscope inner wall - to be used for the hash

For #398 (closed) we need a method to add the hash on all CI builds, as well as the version number on releases.

This MR adds a module to put text on the inside of the inner wall of the microscope body. Intended for the hash, when the version number is on the outer wall at a release.

From the discussion in #398 (closed), the intended use is:

Outer wall logos

• 'Custom' for builds outside the CI
• commit hash for untagged CI builds
• version number for CI builds tagged with a valid release (currently this does not actually work)

Inner wall hash

• '#untracked' for builds outside the CI
• commit hash for all CI builds, including releases.

It does not do anything in the build or CI yet.