graphics: exclude overlay from screenshots (#865)

## Link to GitHub Issue or related Pull Request, if one exists
#0

## Description of change

Adds the `-screenshotoverlay` option.

By default, file screenshots exclude the Spice overlay. Enabling this
option captures screenshots after the overlay is rendered.

Also updates DX11 backend to allow screenshots even when overlay is
disabled.

## Testing

src/spice2x/hooks/graphics/backends/d3d9/d3d9_backend.cpp

@@ -1489,6 +1489,13 @@ void graphics_d3d9_on_present(
         SurfaceHook(device);
     }
 
+    graphics_poll_screenshot_hotkey();
+
+    // before the overlay render so the screenshot excludes it
+    if (!GRAPHICS_SCREENSHOT_INCLUDE_OVERLAY) {
+        graphics_d3d9_process_screenshot(device, SUB_SWAP_CHAIN);
+    }
+
     // Do overlay init as many d3d9 hooks create a dummy instance to get vtable offsets and never
     // call `Present`. This avoids race conditions on `IDirect3D9::CreateDevice` like with
     // `dx9osd.dll` for pfreepanic.
@@ -1508,6 +1515,11 @@ void graphics_d3d9_on_present(
         device->EndScene();
     }
 
+    // after the overlay render so the screenshot includes toasts / menus
+    if (GRAPHICS_SCREENSHOT_INCLUDE_OVERLAY) {
+        graphics_d3d9_process_screenshot(device, SUB_SWAP_CHAIN);
+    }
+
     // for IIDX TDJ / SDVX UFC, handle subscreen
     const bool is_vm = games::sdvx::is_valkyrie_model();
     const bool is_tdj = avs::game::is_model("LDJ") && games::iidx::TDJ_MODE;
@@ -1522,8 +1534,8 @@ void graphics_d3d9_on_present(
         wintouchemu::update();
     }
 
-    graphics_poll_screenshot_hotkey();
-    graphics_d3d9_process_screenshot_and_capture(device, SUB_SWAP_CHAIN);
+    // API capture always includes the overlay
+    graphics_d3d9_process_capture(device, SUB_SWAP_CHAIN);
 }
 
 void update_backbuffer_dimensions(D3DPRESENT_PARAMETERS *params) {