Revert "Change naming convention of standard and non-standard SUs and actions. Removed the "std_" from all standard elements."

This reverts commit 7c138960ba8e9dc892013541645ad00e7efda80c.
Revert "[Feature] In-progress: Change naming convention of standard and non-standard SUs and actions. Changed all non-standard SUs and actions to have a leading underscore."

This reverts commit e90dde46c051b9ef7d3200ede3be871c716a15b2.