Syntax improvements and other stuff I want to add

[GuidoDipietro]

• Ability to use j instead of having to write 1j
• Define j(x) function to simulate shorthand of 1j * x - maybe? -> EDIT: wow fixing this fixed more stuff
• Polar notation with variables yes or no? f(x) = 1 @< x*pi for ex.
• Forbid definition of recursive function to avoid crash later (f(x) = f(x) doesn't crash, but calling it afterwards does) - or allow it with defined base case? What to do on infinite recursion? hmst
• Add built-in quadratic formula or some root finding algorithm in general
• Add support for modulo operator -> bonus: periodic functions can be built now!
• Add phase function -> already had it as angle, lol
• Piecewise function support
• Store literal representation of function/variable and add peek command
• Fix Linux terminal issues with arrows n stuff (gparser.py first line)
• Add for loops, or some type of list mapping for quick repetitive math (i.e. f(1); f(2); f(3); f(4); f(5); in one go) (Come up with a way to combine that with summation/product of a sequence? 🤔)