Apply clang-format across the whole tree

Run clang-format (the repo's .clang-format: LLVM base, 120 cols, tabs,
Allman functions) over every source file so the tree is formatter-clean.
Whitespace only -- no behavior change; full x64 + x86 suites pass.

Also set SortIncludes: false in .clang-format. Windows include order is
load-bearing (windows.h must precede tlhelp32.h / mmreg.h / xinput.h /
dinput.h; winsock2.h must precede windows.h), and the default
alphabetical sort reorders tlhelp32.h ahead of windows.h -- a build
break. Leaving order alone keeps the manual, correct grouping.

tests/text_util_test.cpp

@@ -9,14 +9,12 @@
 
 using namespace coop;
 
-namespace
-{
+namespace {
 int g_failures = 0;
 void check(bool ok, const char* what)
 {
 	std::printf("%s %s\n", ok ? "  ok:" : "FAIL:", what);
-	if (!ok)
-	{
+	if (!ok) {
 		++g_failures;
 	}
 }
@@ -57,8 +55,7 @@ int main()
 
 	// Round-trip preserves the string (ASCII and a non-ASCII code point that must survive
 	// persist/reload of an override key -- the reason narrow/widen exist instead of a byte mask).
-	for (const wchar_t* s : {L"CoopAllTheThings", L"path\\to\\Game (2).exe", L"café.exe", L"游戏.exe"})
-	{
+	for (const wchar_t* s : {L"CoopAllTheThings", L"path\\to\\Game (2).exe", L"café.exe", L"游戏.exe"}) {
 		check(widen(narrow(std::wstring(s))) == std::wstring(s), "narrow->widen round-trips");
 	}