Add module control API, bigcursor with fractional scaling, shared mutex

Module control API:
- Three cdecl exports: WeirdUtils_IsModuleActive, WeirdUtils_DisableModule, WeirdUtils_DisableAll
- C header include/weirdutils_api.h for runtime DLL discovery
- All modules gain pub module_name, isActive(), shared mutex via src/mutex.zig
- build.zig refactored to module_list array of ModuleDesc

Bigcursor:
- D3D9 vtable hooks on SetCursorProperties/ShowCursor
- Scale2x/Scale3x pixel-art upscalers in pure Zig (replaces 12K-line hqx C)
- Bilinear resampler for fractional scales (1.0-4.0, default 1.2)
- Win32 cursor via CreateIconIndirect bypasses D3D9 32x32 limit
- FNV-1a hash cache for ~16 cursor bitmaps
- Lua API: SetCursorScale(n) / GetCursorScale()
- CVar cursorScale for Config.wtf persistence (tenths)

Other:
- Add dpslog module stub
- Docs and README updates

src/lua.zig

@@ -66,7 +66,7 @@ pub fn pushnil(L: State) void {
 
 pub fn pushnumber(L: State, n: f64) void {
     // __thiscall: ECX=L, f64 on stack [EBP+8]/[EBP+0xc], ret 8.
-    // .never_tail: callee-cleanup pops stack args — tail-call would corrupt the stack.
+    // .never_tail: callee-cleanup pops stack args - tail-call would corrupt the stack.
     const f: *const fn (State, f64) callconv(.{ .x86_thiscall = .{} }) void = @ptrFromInt(0x6F3810);
     @call(.never_tail, f, .{ L, n });
 }
@@ -136,8 +136,7 @@ pub fn luaError(L: State, msg: [*:0]const u8) void {
         : [L] "r" (@intFromPtr(L)),
           [msg] "r" (@intFromPtr(msg)),
           [func] "r" (@as(u32, 0x6F4940)),
-        : .{ .eax = true, .ecx = true, .edx = true, .memory = true, .cc = true }
-    );
+        : .{ .eax = true, .ecx = true, .edx = true, .memory = true, .cc = true });
 }
 
 pub const LuaReg = extern struct {