v1.2

• "Make filler" command, allowing to mark undefined bytes as unimportant filler.
• "Next undefined" command. Together with "Make filler" allows to follow reductionistic workflow, where a user searches for next undefined byte sequence and categorizes it (or skips for now, easily findable later).
• ELF loader: Fix loading of executable with REL relocations (e.g. x86) and generalize to easier support architecture-specific features.
• Number of minor UX improvements.
• Continue switching to picotui widget set.