touch: native touch hooks to honor Invert Touch option (#588)

## Link to GitHub Issue or related Pull Request, if one exists
For #587 

## Description of change
`Invert Touch` option is now honored by the IIDX/SDVX touch handler.

src/spice2x/launcher/options.cpp

@@ -1532,9 +1532,9 @@ static const std::vector<OptionDefinition> OPTION_DEFINITIONS = {
         .category = "Touch Parameters",
     },
     {
-        .title = "Invert Raw Input Touch",
+        .title = "Invert Touch",
         .name = "touchinvert",
-        .desc = "Inverts raw touch coordinates; only works for default raw input handler, "
+        .desc = "Inverts touch coordinates; only works for default raw input handler and IIDX/SDVX native touch handler,"
                 "and not Windows Touch API.",
         .type = OptionType::Bool,
         .category = "Touch Parameters",

src/spice2x/misc/nativetouchhook.cpp

@@ -92,6 +92,10 @@ namespace nativetouchhook {
             }
         }
 
+        if (rawinput::touch::INVERTED) {
+            flip_values = !flip_values;
+        }
+
         for (size_t i = 0; i < cInputs; i++) {
             PTOUCHINPUT point = &pInputs[i];