Refactor major program systems/functionality

[lgactna]

i.e.:
stop redoing entire calculations on every mouse move event
stop redrawing the entire thing on every mouse move event
stop destroying the entire table, then rebuilding the entire table on every mouse move event
make the algorithms more efficient by saving stuff in lists

• Fix the table system

• Fix the overlap system

• Fix the draw system

[lgactna]

is now a bigger blanket of "overhaul the drawing and overlap system", inherits #11, #14, #17.