Allow offline symbol resolution with any addr2line-compatible tool

The addr2line backend of tracy-update now builds on every platform, including Windows, and can be pointed at any addr2line-compatible executable:

- `-a`: path to a custom symbol resolution tool (e.g. `llvm-addr2line` or a cross-compilation toolchain's `addr2line`). Works on all platforms and takes precedence over the platform default (DbgHelp on Windows, the `addr2line` found in `PATH` elsewhere). Path-like values are validated up front so a wrong path fails with an actionable message instead of a cryptic, localized shell error.
- `-A`: extra arguments passed verbatim to the tool, e.g. `--relative-address` so `llvm-addr2line`/`llvm-symbolizer` accept the image-relative offsets Tracy records for images with a non-zero preferred base (PE, Mach-O).
- `-v`: verbose output while patching symbols.

update/src/OfflineSymbolResolverDbgHelper.cpp

@@ -122,8 +122,8 @@ private:
 
 char SymbolResolver::s_symbolResolutionBuffer[symbolResolutionBufferSize];
 
-bool ResolveSymbols( const std::string& imagePath, const FrameEntryList& inputEntryList,
-                    SymbolEntryList& resolvedEntries )
+bool ResolveSymbolsDbgHelp( const std::string& imagePath, const FrameEntryList& inputEntryList,
+                            SymbolEntryList& resolvedEntries )
 {
     static SymbolResolver resolver;
     return resolver.ResolveSymbolsForModule( imagePath, inputEntryList, resolvedEntries );