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.

common/include/coop/dpi.hpp

@@ -9,8 +9,7 @@
 
 #include <windows.h> // USER_DEFAULT_SCREEN_DPI (== 96, the 100%-scale baseline)
 
-namespace coop
-{
+namespace coop {
 
 // ImGui's built-in default font (ProggyClean) rasterizes at this pixel size at 100% scale. Named once
 // here so the DPI math scales from a single owned constant instead of a bare 13 sprinkled around.
@@ -26,8 +25,7 @@ inline constexpr float kMaxUiScale = 8.0f;
 // callers never derive a zero-size font.
 inline float dpi_scale_from(unsigned dpi)
 {
-	if (dpi == 0)
-	{
+	if (dpi == 0) {
 		dpi = USER_DEFAULT_SCREEN_DPI;
 	}
 	const float scale = static_cast<float>(dpi) / static_cast<float>(USER_DEFAULT_SCREEN_DPI);