2.58.22, source expression refactoring

[larshp]

No description provided.

[github-actions]

Regression test results:

Repository	Issues	Runtime	Target Version
FreHu/abap-turtle-graphics	🟢 0 -> 0	🟢 2s -> 2s	v753
Microsoft/ABAP-SDK-for-Azure	🟢 0 -> 0	🟢 4s -> 5s	v753
SAP/code-pal-for-abap	🟢 0 -> 0	🟢 21s -> 21s	v740sp08
Sumu-Ning/AES	🟢 0 -> 0	🟢 6s -> 6s	v702
abaplint/abaplint-sci-client	🟢 0 -> 0	🟢 19s -> 19s	v702
abaplint/deps	🟢 0 -> 0	🟢 2s -> 2s	v702
jrodriguez-rc/abap-tasks-tracker	🟢 0 -> 0	🟢 2s -> 2s	v750
larshp/abap-wasm	🟢 0 -> 0	🟢 2s -> 2s	Cloud
larshp/abapGit	🟢 0 -> 0	🟢 23s -> 23s	v702
larshp/abapGitServer	🟢 0 -> 0	🟢 20s -> 20s	v740sp08
larshp/abapOpenChecks	🟢 0 -> 0	🟢 11s -> 11s	v740sp02
larshp/abapPGP	🟢 0 -> 0	🟢 8s -> 8s	v754
sapmentors/abap2xlsx	🟢 0 -> 0	🟢 13s -> 13s	v702
sbcgua/abap-string-map	🟢 0 -> 0	🟢 3s -> 3s	?
sbcgua/ajson	🟢 0 -> 0	🟢 4s -> 4s	v702
sbcgua/mockup_loader	🟢 0 -> 0	🟢 5s -> 5s	?
sbcgua/text2tab	🟢 0 -> 0	🟢 4s -> 4s	?

Updated: 2020-10-28T16:10:31.710Z

SHA: d97d944