PHLEGM v8 revision 84: optional r prefix for revision/checkpoint

- Canonical new distribution ZIP names use -r84 immediately before the timestamp.
- Legacy revision sections -83 remain valid inputs; r83 / 83 resolve to numeric 83.
- A missing or blank checkpoint/revision omits the entire filename suffix and GUI title suffix.
- checkpoint.current and revision.current are the same identifier. Config accepts 84 or r84, GUI displays Phlegmulator v8 r84 (never rr84).
- Developer and End-User packaging and source-carrier recovery accept both naming schemes.
- Preserve legacy ZIPs; do not rename older checkpoints.
- Also corrected r83 build regression: imported DSWS AA/FBVM *.bas/*.bi/*.md text was LF-only, rejected by PHLEGM's strict CRLF pre-build validator. Normalized these source files to CRLF. *.sh remains LF-only.
- Previous End-User archive-retention fix and CHOP work remain untouched.
- Test Windows 32/64 OpenGL/D3D11 and Linux x86/x86_64 backends with native FreeBASIC; this source checkpoint does not claim native runtime testing.
