Show errors and warnings on the display (_ERROR, _WARN)

action_raise_error aborts while the macro renders, so an M117 in the same
macro never ran and errors such as the RESUME lane check only reached the
console. messages.cfg adds _ERROR (M117, then raise in a separate macro)
and _WARN (RESPOND TYPE=error + M117); all errors and warnings use them.
PAUSE shows AFC's error as the pause reason; RESUME, CANCEL_PRINT and
PRINT_WARMUP clear the display.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -16,6 +16,7 @@ everything below, grouped by topic. Comment out what you do not use there.
 | File | Macros | Needs |
 |---|---|---|
 | `save_variables.cfg` | the one `[save_variables]` for all macros (file `bd_pa_variables.cfg` in the config folder) | — |
+| `messages.cfg` | `_ERROR`, `_WARN`: errors and warnings shown in the console and on the display (M117, the status line in Mainsail and KlipperScreen); PAUSE shows AFC's error, RESUME, CANCEL_PRINT and PRINT_WARMUP clear the display | — |
 | **blobifier/** | | |
 | `blobifier.cfg` | `BLOBIFIER`, `BLOBIFIER_CLEAN`, `BLOBIFIER_PARK`, `BLOBIFIER_SHAKE_BUCKET`, ...: purge bucket and nozzle brush for AFC (Turtleblobifier, heavily modified) | Blobifier hardware, AFC |
 | `blobifier_hw.cfg` | servo and bucket switch pins | — |