ae.sys.cmd: Cleanup
ae.sys.d.build: Rename to builder
ae.sys.git: Add invariant
ae.sys.d.manager: Initial commit
ae.sys.d.manager: Add preparePrerequisites
ae.sys.d.manager: Add prepareEnv
ae.sys.d.manager: Remove currentPath from DManager
ae.sys.d.manager: Add prepareBuilder, build, clean
ae.sys.d.manager: Remove applyEnv