SlimApp ported into ideomatic C++ (OOP-style) on a separate branch (cpp): https://github.com/HardCoreCodin/SlimApp/tree/cpp/src

Notable changes:

• Structs now embody their related functions as member methonds (including App and PixelGrid which now embeds all drawing functions)

• Entry point (only thing that needs to be defined) is now ```cpp SlimApp* createApp()

  instead of: ```c
void initApp(Defaults *defaults)

it now needs to return a pointer to the app, which could be an instance of a sub-class

• All callbacks are now overridable virtual methods on the SlimApp struct.

• init is now a virtual method and has a detault implementation (so not required):

bool SlimApp::OnReady()

• The Defaults stuct members were moved into the app instance. They can be overridden either in createApp() or OnReady().

• Platform moved to being a (static)struct with static-only members os instead of a member instance of App (app.platform) so: cpp os::setWindowCapture(true); os::setCursorVisibility(false); instead of: ```c app->platform.setWindowCapture(true); app->platform.setCursorVisibility(false);

- Rect now passed by refference (instead of by pointer):
```cpp
void drawShapesToCanvas(PixelGrid &canvas) {
    // Draw and fill a rectangle with different colors:
    Rect rect;
    rect.min.x = rect.min.y = 100;
    rect.max.x = rect.max.y = 300;
    canvas.fillRect(Color(Blue), rect);
    canvas.drawRect(Color(Red ), rect);

All sample apps tested and working.