Improve FNN Layer and Model Performance #610
Description
Is your feature request related to a problem?
Currently our model is doing fine performancewise, since we just support FNN-Layers. But since we will also implement CNNs, which partly depend on FNN-Layers it is important for them to be performance-optimal, since small suboptimal implementations that don't really impact FNNs, will have a huge impact on computing time when working with Images.
Desired solution
Rework some code parts to optimize computing time and fix some bugs, everything discussed with @Marsmaennchen221
Possible alternatives (optional)
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Additional Context (optional)
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