Added basic LPF and HPF, although I don't think they'll work.
Miscellanious bugfixing.
Overhauled some aspects of module structure.
Overhauled Oscillator.
Fixed Copyer and Merger as well.
Fixed Distortion and made a very small aesthetic change in RangeModifier.
Fixed a few engine bugs, especially concerning the two filters.
Did the rightclick menu the way it's supposed to be instead of implementing everything myself.
Made it possible to destroy modules by right-clicking on them.