Split MainMenu.xib into two (REnamer, c4536d6)

Created 1/19/2008, updated 3/5/2024

snippets

Separate out the functionality that was in the MainMenu.xib into two segments: app-wide stuff (like the preference window) and per-window stuff (like the preview pane, the Find/Replace window etc).

Signed-off-by: Greg Hurrell <greg@hurrell.net>