ConfigReader: normalize the case of enum-like capture options

[Cybis320]

Config option names are case-insensitive (RawConfigParser lowercases keys), but values are read raw, while several are compared against lowercase or uppercase string literals. A value with the wrong case doesn't raise — it silently falls through to the other branch, so the station runs in a mode its config doesn't describe.

The clearest example is protocol:

config.protocol = parser.get(section, "protocol")   # ConfigReader.py

if self.config.protocol == 'udp':                   # BufferedCapture.py
    protocol_str = f"protocols=udp {common_timeouts}"
else:
    protocol_str = f"protocols=tcp {common_timeouts}"

protocol: UDP captures over TCP, and ObservationSummary still reports protocol_in_use as "UDP" — so the summary disagrees with what GStreamer actually did.

Five options are affected. Each is now normalized where it's parsed:

Option	Compared against	Normalization
protocol	'udp' (BufferedCapture.py)	.strip().lower()
media_backend	'gst', 'v4l2' (BufferedCapture.py)	.strip().lower()
frame_cleanup	'delete', 'tar' (Reprocess.py)	.strip().lower()
frame_file_type	'png' (RawFrameSave.py)	.strip().lower()
gst_colorspace	'GRAY8' (BufferedCapture.py)	.strip().upper()

gst_colorspace goes the other way on purpose: it is interpolated into GStreamer caps as format=..., and those format names are uppercase.

Deliberately left alone:

• ff_format — used as a literal filename extension, so forcing case would change files on disk.
• All *_file / *_dir / *_path options — filesystem paths, case-sensitive on Linux.
• shower_color_map, sporadic_color — matplotlib names, case-sensitive there.
• gst_decoder — passed straight through as a GStreamer element name, never compared to a literal here.

Note that section headers ([Capture], [MeteorDetection], …) remain case-sensitive; has_section matches exactly, so a mis-cased header silently skips the whole section. That's a broader change and isn't touched here.

Testing

Parsed the shipped .config unmodified — values unchanged (tcp, gst, BGR, jpg, delete). Parsed a copy with protocol: UDP (trailing spaces), media_backend: GST, gst_colorspace: gray8, frame_file_type: PNG, frame_cleanup: Delete — all five resolve to the canonical form the consumers expect.

[dvida]

Follow-up pushed in bcc412d to address the GStreamer format-casing review finding.

Extent of the change:

• The production adjustment is limited to gst_colorspace parsing: whitespace is trimmed, the RMS-supported bgr and gray8 spellings are canonicalized to BGR and GRAY8, and all other GStreamer format tokens retain their exact case.
• The original lower-case normalization for protocol, media_backend, frame_file_type, and frame_cleanup is unchanged.
• Added focused ConfigReader regression coverage for all five options and for case-sensitive GStreamer formats (RGBx, xRGB, v210, and r210).

Validation completed:

• python -m pytest Tests/test_ConfigReader.py -q: 5 passed.
• The shipped .config still parses as tcp, gst, BGR, jpg, and delete.
• GStreamer caps smoke test: canonical RGBx succeeds; altered RGBX fails negotiation, confirming that preserving case is required.
• git diff --check: clean.

@Cybis320, please review this follow-up and test it on your GStreamer/station setup, particularly the BGR/GRAY8 normalization and any case-sensitive color-space value you use. Please report the result here.

[Cybis320]

Changes look good to me.

Follow-up pushed in bcc412d to address the GStreamer format-casing review finding.

@Cybis320, please review this follow-up and test it on your GStreamer/station setup, particularly the BGR/GRAY8 normalization and any case-sensitive color-space value you use. Please report the result here.