New rules:
`InsertNewlineAtEOF: true`
`RemoveSemicolon: true`
`RequiresClausePosition: WithPreceding`

find ./Source/ -name '*.cpp' -o -name '*.h' | xargs clang-format-19 -i

`Common::IsLower(char)` was omitted as nothing needed it.

IniFile: Migrate `Common::CaseInsensitiveLess` to StringUtil

With 12 uses of `JoinStrings` in the codebase vs 36 uses of `fmt::join`, fmtlib's range adapter for string concatenation with delimiters is clearly the preferred option.

Migrating `Common::CaseInsensitiveLess` to StringUtil.h will hopefully discourage rolling one's own solution in the future for case-insensitive associative containers when this (quite robust!) solution already exists.

`Common::CaseInsensitiveStringCompare::IsEqual` was removed in favor of using the `Common::CaseInsensitiveEquals` function.

The `a.size() != b.size()` condition in `Common::CaseInsensitiveEquals` can be removed, since `std::ranges::equal` already checks this condition (confirmed in libc++).

IOS/KD: Add WiiLink as WC24 service provider by default