[dMopp]

Release UmbrielMod 0.6.0.

Merging this tags v0.6.0 on main and publishes the GitHub release with
these notes (any merge method works):

Added

• Search in the raw editor: Ctrl+F opens a search bar that
  highlights every match and shows "n of m"; Enter /
  Shift+Enter (or the arrow buttons) jump between matches,
  "Aa" matches case, Esc closes it.

Fixed

• Decimal options and shader constants keep up to six decimal places. The
  number fields had a fixed 1–3 digits, so a value such as 0.125 was shown as
  0.13, rounded to that when the field lost focus, and more decimals could not
  be typed at all.
• Closing the window with unsaved changes asks again instead of closing without
  the dialog, and the raw editor shows "Edited" again after a change (both
  handlers shadowed the translation function and failed).