* Implement diffing individual data symbols
* Remove unused code for diffing sections
* Data diff view: Make rows show offset within the symbol, not within the section
* Remove SelectedSymbol enum as it only has a single variant now
* Create fake data section symbols to allow diffing entire sections again
* Fix text sections not having their size zeroed out
* Update test snapshots
* Clean up code for inferring section symbol size
* Fix bug where PPC pool references weren't ignoring section symbols
* Update comment
* Always add unique section symbols for data sections
* Update test snapshots
* Remove unnecessary clone in format! call
* Auto-start mapping for unpaired data symbols
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