Add font fallback

Note: All the `First()` in the code are temperary workarounds to make it work and require refractoring

Source/Engine/Render2D/FontManager.cpp

@@ -155,6 +155,9 @@ bool FontManager::AddNewEntry(Font* font, Char c, FontCharacterEntry& entry)
 
     // Get the index to the glyph in the font face
     const FT_UInt glyphIndex = FT_Get_Char_Index(face, c);
+    if (glyphIndex == 0) {
+        LOG(Warning, "Font `{}` doesn't contain character `\\u{:x}`, consider choosing another font. ", String(face->family_name), c);
+    }
 
     // Load the glyph
     const FT_Error error = FT_Load_Glyph(face, glyphIndex, glyphFlags);