touch: restore wintouchemu, fall back to it when native touch hooks fail (#834)

## Link to GitHub Issue or related Pull Request, if one exists
Fixes #833

## Description of change
Last couple PRs - such as #820 #827 #828 - made the native touch hook &
touch injection using `InjectTouchInput` the default path, since it
performs much more reliably with both real touch screens and mouse (or
any other synthetic source).

However, user has reported that WINE lacks `InjectTouchInput` which
means this won't work.

As a fix, revive the old wintouchemu code. Native touch is still the
default, but under following circumstances:

1. if `-touchemuforce` is set, or
2. if any of the required Windows touch APIs are unavailable

then we fail over from native touch to wintouchemu code. 

For Linux, condition #2 would be hit during init, and gracefully switch
over.

Caveat: the poke code for IIDX and Nost will continue to require native
touch, I do not want to maintain two paths for this. This means that
iidx poke will stop working on Linux, unfortunately.

## Testing
Tested on Windows with `-touchemuforce` set. This is mostly reverting
Linux code path back to where we were last release, so this should just
work with wine.

src/spice2x/games/sdvx/sdvx.cpp

@@ -26,6 +26,7 @@
 #include "util/libutils.h"
 #include "util/sysutils.h"
 #include "misc/eamuse.h"
+#include "misc/wintouchemu.h"
 #include "touch/native/nativetouchhook.h"
 #include "bi2x_hook.h"
 #include "camera.h"
@@ -453,7 +454,18 @@ namespace games::sdvx {
             }
 
             if (is_valkyrie_model()) {
-                nativetouch::hook(avs::game::DLL_INSTANCE);
+                const auto native_touch_ready = !wintouchemu::FORCE &&
+                    nativetouch::hook(avs::game::DLL_INSTANCE);
+                if (!native_touch_ready) {
+                    wintouchemu::FORCE = true;
+                    if (!GRAPHICS_WINDOWED) {
+                        wintouchemu::INJECT_MOUSE_AS_WM_TOUCH = true;
+                        wintouchemu::hook_title_ends(
+                            "SOUND VOLTEX",
+                            "Main Screen",
+                            avs::game::DLL_INSTANCE);
+                    }
+                }
 
                 // insert BI2X hooks
                 bi2x_hook_init();