Add Input functionality to Ultra

- Add point InSpace check to PD::Li::Math
- Add Universal AlignmentCenter flag for Horizontal and and Vertical Alignment
-  Add Fallbackfont to Layout (if you dont want to set font per object)
- Add Button Object WIP
- Rename OnHover to OnFocus and add OnUnfocus
- Move font and FontScale to ElementBase (for fallback logic etc)
- Add UpdateInput func to ElementBase
- Corectly Set fontScale in Text Rendering
- Update ecample

source/ultra/layout.cpp

@@ -7,6 +7,7 @@ PD_API void Layout::Render(PD::Li::Drawlist& list) {
   float fc = list.GetFontScale();
   list.SetFontscale(GetCanvas().VTranslateFontscale(fc));
   for (auto& it : GetElements()) {
+    it->SetFontIfNull(*pFont);
     it->Update();
     it->Draw(list);
   }