overlay: UI scaling option (#495)

## Link to GitHub Issue, if one exists
#477 

## Description of change
Add a new option for scaling the overlay.

Gitadora Arena will receive 250% by default.

Various overlay windows have been updated to scale properly, not perfect
but they are at least usable.

src/spice2x/launcher/launcher.cpp

@@ -959,6 +959,12 @@ int main_implementation(int argc, char *argv[]) {
     if (options[launcher::Options::DisableOverlay].value_bool()) {
         overlay::ENABLED = false;
     }
+    if (options[launcher::Options::OverlayScaling].is_active() && !cfg::CONFIGURATOR_STANDALONE && !cfg_run) {
+        const auto val = options[launcher::Options::OverlayScaling].value_uint32();
+        if (10 <= val && val <= 400 && val != 100) {
+            overlay::UI_SCALE_PERCENT = options[launcher::Options::OverlayScaling].value_uint32();
+        }
+    }
     if (options[launcher::Options::DisableAudioHooks].value_bool()) {
         hooks::audio::ENABLED = false;
         deferredlogs::defer_error_messages({

src/spice2x/launcher/options.cpp

@@ -383,12 +383,24 @@ static const std::vector<OptionDefinition> OPTION_DEFINITIONS = {
         .disabled = true,
     },
     {
+        // DisableOverlay
         .title = "Disable Spice Overlay",
         .name = "overlaydisable",
         .desc = "Disables the in-game overlay",
         .type = OptionType::Bool,
         .category = "Overlay",
     },
+    {
+        // OverlayScaling
+        .title = "Spice Overlay UI Scale %",
+        .name = "overlayscale",
+        .desc = "Forces UI scaling for the overlay, "
+            "things can look off since the UI was written for 100% scaling. "
+            "Enter value in percentage, between 10-400, inclusive",
+        .type = OptionType::Integer,
+        .setting_name = "200",
+        .category = "Overlay",
+    },
     {
         // spice2x_FpsAutoShow
         .title = "Auto Show FPS/Clock",

src/spice2x/launcher/options.h

@@ -47,6 +47,7 @@ namespace launcher {
             SOFTID,
             VREnable,
             DisableOverlay,
+            OverlayScaling,
             spice2x_FpsAutoShow,
             spice2x_FpsOpposite,
             spice2x_SubScreenAutoShow,