wip: LyoD command-line generation - DOES NOT WORK

[berezovskyi]

Description

Checklist

• This PR adds an entry to the CHANGELOG. _See https://keepachangelog.com/en/1.0.0/ for instructions. Minor edits are exempt.
• This PR expects some manual changes to the generated code. The needed changes are detailed in the CHANGELOG entry.
• This PR was tested with at least one code generation, resulting in a working OSLC server.
• This PR does NOT break the user block code

Issues

Closes #0; Closes #00

(use exactly this syntax to link to issues, one issue per statement only!)

[berezovskyi]

@Jad-el-khoury The main problem so far is the Acceleo downgrade to the old SNAPSHOT. I managed to get a generation once out of it but it did not preserve any user block - just overwrote them with defaults. I gave up for now until we decide on the Acceleo 4 migration, because v4 comes with a working Maven demo: https://github.com/eclipse-acceleo/acceleo/tree/b94a5ef8c876ecedf5fd277be4397da9401682c8/examples/MavenLauncher