Add curves to Curves.java

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Test all of the curves and ensure proper implementation. Not all of these will be used on the bot, but are for personal implementation and possible future use for the bot or other code. The following formulas may be implemented, obviously in forms to ensure a double value of -1<x<1 with 0 being the neutral value:

• x*sqrt(x)
• 1/sqrt(x)
• x^sqrt(x)
• tangential curve
• quadratic curve
• cubic: x^3
• absolute value curve
• logarithmic curve next to the exponential curve function
• cyclonic curve (used in encoding for wheels) Wikipedia
• Swastika curve Wikipedia
• Brachistochrone maybe, probably not needed for the bot though, rather design Wikipedia

This is all for now. More will be in comments.

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• 2^(x/2^x) - for quicker acceleration in the program. causes a spike then levels out and can be hooked to a timer and a multiplier. graph to see. rises quickly and spikes, then levels out. Asymptote at y = 0.