Optimization property, where: unsigned ints get replaced with bytes

[GiorgosXou]

Since neural-networks in MCUs are not usually larger than 255 in numberOflayers or units\neurons-per-layer, it would be a great idea to add another user-defined optimization property, for those who really care to save a few extra bytes of RAM. I had this idea before but since I almost forgot about it, I decided to make this post as a reminder.

NeuralNetworks/src/NeuralNetwork.h

Line 963 in 6c95e89

unsigned int AtlayerIndex; // who 's gonna make a network with more than 255 layers :P ?!?!? but anyways i will use int or i will add byte too, using a property definition with bunch of other things like this for max optimization ... lol