feat(api): make FreeType a toggleable option which is disabled by default (#254)

* deps(build): bump FreeType from 2.12.1 to 2.13.3

* fix(generator): add missing ImGuiFreeTypeBuilderFlags

* feat(generator): add possibility to provide additional defines specifically for AST

* feat(api): make FreeType optional and disabled by default

FreeType renderer is still included in the final build.
Its usage is toggleable and DISABLED by default.

imgui-binding/src/generated/java/imgui/ImFontAtlas.java

@@ -460,6 +460,32 @@ public final class ImFontAtlas extends ImGuiStructDestroyable {
     // Building in RGBA32 format is provided for convenience and compatibility, but note that unless you manually manipulate or copy color data into
     // the texture (e.g. when using the AddCustomRect*** api), then the RGB pixels emitted will always be white (~75% of memory/bandwidth waste.
 
+    /*JNI
+        #ifdef IMGUI_ENABLE_FREETYPE
+        #include "misc/freetype/imgui_freetype.h"
+        #endif
+     */
+
+    /**
+     * <b>BINDING NOTICE:</b> This method is specific to the imgui-java binding.
+     * <p>
+     * Since FreeType is included in the final build, it's possible to use both font renderers (STB_TrueType and FreeType) simultaneously without needing to rebuild the library.
+     * By default, we use small hacks to set STB_TrueType as the default font renderer. However, this method allows you to enforce the use of the FreeType renderer.
+     * <p>
+     * This method MUST be called before invoking the "#build" or "#getTexData*" methods.
+     *
+     * @param enabled true to enable the FreeType font renderer
+     */
+    public native void setFreeTypeRenderer(boolean enabled); /*
+        #ifdef IMGUI_ENABLE_FREETYPE
+        if (enabled) {
+            THIS->FontBuilderIO = ImGuiFreeType::GetBuilderForFreeType();
+        } else {
+            THIS->FontBuilderIO = NULL;
+        }
+        #endif
+    */
+
     /**
      * Build pixels data. This is called automatically for you by the GetTexData*** functions.
      */