Revert "Add UI controls for particle number adjustment and simulation restart"

[StuartJAtkinson]

Reverts StuartJAtkinson/Newtonian-Particle-Simulator#2 Didn't work

[codeautopilot[bot]]

PR summary

This Pull Request reverts a previous commit that added UI controls for adjusting the number of particles and restarting the simulation. The reason for the revert is that the changes did not work as intended. The revert removes the newly added UI elements and associated logic from the MainWindow.cs, ParticleSimulator.cs, and Program.cs files.

Suggestion

To avoid similar issues in the future, consider implementing unit tests and integration tests for new features before merging them into the main branch. This will help ensure that new functionalities work as expected and do not introduce regressions.

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