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/dpi_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;
 	}
 }