Major Update

Many fixes added. Some include:
-Powers are now done from left to right incase an equation is like this:
2^3^2, where it'll do 2^9 since 3^2 will done first as it should.
-Powers can now be done with negative exponents
-Brackets in brackets now work, before they were broken and weren't
actually working
-Bracket exponents now work

Still to do:
-Optimize, change code to be more efficient