prevent sql injection by using sqlite formatter on various code that generates sql stmts with switch_snprintf

This partially reverts commit 991b83d2.

man editline(3el) says that they're not.

[take #2, originally was 48acc0cd]

This reverts commit 48acc0cd.

This reverts commit 324110bf.

...at least until registration opens for next year's ClueCon.

In .fs_cli_conf, set:

  prompt-color => blue
  input-text-color => red
  output-text-color => yellow

The CLI prompt and any text-in-progress now stays cleanly below log
messages and other received output from FS.

This also implements hardcoded prompt coloring.

man editline(3el) says that they're not.

Modern linux systems don't write volatile information to /etc.