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/nost/nost.cpp

@@ -2,6 +2,7 @@
 #include "poke.h"
 #include "touch_mode.h"
 #include "hooks/setupapihook.h"
+#include "misc/wintouchemu.h"
 #include "touch/native/nativetouchhook.h"
 #include "avs/game.h"
 
@@ -41,9 +42,15 @@ namespace games::nost {
         setupapihook_init(avs::game::DLL_INSTANCE);
         setupapihook_add(touch_settings);
 
-        nativetouch::hook(avs::game::DLL_INSTANCE);
-        if (ENABLE_TOUCH_MODE) {
-            touch_mode::enable();
+        const auto native_touch_ready = !wintouchemu::FORCE &&
+            nativetouch::hook(avs::game::DLL_INSTANCE);
+        if (!native_touch_ready) {
+            wintouchemu::FORCE = true;
+            wintouchemu::hook("nostalgia", avs::game::DLL_INSTANCE, 20);
+        } else {
+            if (ENABLE_TOUCH_MODE) {
+                touch_mode::enable();
+            }
         }
     }
 

src/spice2x/games/nost/poke.cpp

@@ -9,6 +9,7 @@
 #include "rawinput/rawinput.h"
 #include "misc/eamuse.h"
 #include "touch/native/inject.h"
+#include "touch/native/nativetouchhook.h"
 #include "util/logging.h"
 #include "util/precise_timer.h"
 
@@ -59,6 +60,11 @@ namespace games::nost::poke {
             return;
         }
 
+        if (!nativetouch::is_hooked()) {
+            log_warning("poke", "Nostalgia poke requires native touch; disabled");
+            return;
+        }
+
         // create new thread
         THREAD_RUNNING = true;
         THREAD = new std::thread([] {