RastaConverter1.0-RC4

• Added ANTIC 4 character-mode output. Select it in the Live UI or with
  /graphics_mode=antic4; ANTIC E remains the default.
• Added Normal and Wide playfield selection to both ANTIC E and ANTIC 4.
  Normal is the default; use /playfield=wide when the extra horizontal image
  area is preferred.
• Corrected the ANTIC/GTIA model and generated XEX timing for both playfield
  widths, including display-list DMA, LMS and character-fetch badlines,
  refresh deferral, CHBASE transitions, and horizontal register changes.
• Fixed blinking ANTIC 4 executables, incorrect colours at the left edge of a
  wide playfield, and differences between optimizer output and Altirra.
• Normal-width executables cover the unused side regions with missiles. ANTIC 4
  uses fifth-player priority conflicts to produce black independently of
  COLPF3, while ANTIC E uses its corresponding missile border schedule.
• Added complete ANTIC 4 export: screen and character data, PMG data, raster
  programs, optimizer state, and a dedicated MADS template. Existing
  width-less ANTIC 4 state remains compatible and is interpreted as Wide.
• Added GUI support throughout setup, preview, copied command lines, recent-run
  badges, and XEX freshness detection. Dual-frame controls remain disabled for
  ANTIC 4 because it is currently single-frame only.
• Recent Conversion cards now identify both graphics mode (TEXT/GFX) and
  playfield width (WIDE/NORM), with higher-contrast badge palettes tailored to
  the Dark, High Contrast, and Light themes.
• Editor preferences now survive restarts independently of conversion recipes:
  theme, font size, setup window and splitter sizes, collapsed sections,
  "Only changed", and whether new conversions use their own subfolder.
• The in-conversion viewer now hides its Mask display controls when no details
  mask is active, while retaining the neutral layer needed to start live
  painting.
• Expanded automated coverage for the four mode/width timing profiles, command
  configuration, line-cache isolation, and persistent UI preferences. ANTIC E
  and ANTIC 4 output was also checked against Altirra.
• Removed an accidentally committed Python bytecode cache and corrected the
  ANTIC 4 proof tool to use the released wide-playfield timing schedule.