Refactor C++ Simulators: Extract Common UI Code into MPW Framework

[Fumapps]

Motivation

Currently, the SDL based UI rendering code is duplicated in the Hamster and Kara simulator. This is bad, hence the common code shall be extracted into the C++ MPW Simulator Framework.

Note

This will introduce a dependency in the C++ MPW Simulator Framework to the SDL2/Nanogui libraries.