PPCSymbolDB: Refactor SymbolMap Save/Load

[sepalani]

This PR refactors parts of the loading/saving process of symbol map. I'm putting it as a draft for now as I'd like to wait for https://dolp.in/pr13113 to be merged first.

This PR fixes issues I had where some symbols weren't loaded properly (which might get saved later). Here are some examples on how they can alter existing symbol maps.

The alignment wasn't properly detected and 0 was detected as name by sscanf.

This issue was also caused by the namepos/strstr logic which is flawed when the name is small and equals to part of the symbol address, size or vaddress. Moreover, checking for a space doesn't work when alignment is 16. I've seen this alignment value on some *fill* symbols.

-80468370 00000008 80468370 0 TRKPositionFile (entry of .text)  TRK_Hollywood_Revolution.a C:\products\RVL\runtime_libs\debugger\embedded\MetroTRK\Processor\
+80468360 00000008 80468360 0 0468360 00000008 80468360 0 TRKPositionFile (entry of .text)      TRK_Hollywood_Revolution.a C:\products\RVL\runtime_libs\debugger\embedded\MetroTRK\Processor\

savegpr / loadgpr entry wasn't properly detected

This issue also trimmed the object names after the "entry of" part.

-80456e54 000018 80456e54 0 _restgpr_27 (entry of __restore_gpr)        Runtime.PPCEABI.H.a runtime.o
+80456e54 000018 80456e54 0 __restore_gpr::

This PR is ready to be reviewed and tested. I also advise people testing this PR to backup their symbol maps just in case or test this PR in a dedicated portable build.

[sepalani]

As #13113 was merged, this PR is ready to be reviewed and tested.

[dreamsyntax]

I assume I should be able to just load an existing symbol map, then re-save and this should apply?

[sepalani]

I assume I should be able to just load an existing symbol map, then re-save and this should apply?

Indeed that should work. It won't restore symbols which have already damaged (e.g. _restgpr_27 becoming __restore_gpr::), though.

[dreamsyntax]

If I have my map file in the \maps folder and use this build, Dolphin crashes on game boot (flatpak x64).

/app/bin/dolphin-emu-wrapper: line 6:    13 Aborted                 (core dumped) dolphin-emu "$@"

If I have no map file, boot the game, place the map file in \maps folder, and then choose Load Map
Dolphin hangs until I try to do another action, then crashes.

This is my map incase it's useful:
https://raw.githubusercontent.com/ShadowTheHedgehogHacking/shadow-symbols-and-dmw/refs/heads/main/GUPE8P.map

I verified the latest dev flatpak works as expected with the map.