Resolve "Refactor Operations in GUI"

b_asic/GUI/gui_interface.py

b_asic/GUI/improved_main_window.py

b_asic/GUI/operation_icons/abs.png

b_asic/GUI/operation_icons/abs_grey.png

b_asic/GUI/operation_icons/add.png

b_asic/GUI/operation_icons/add_grey.png

b_asic/GUI/operation_icons/bfly.png

b_asic/GUI/operation_icons/bfly_grey.png

b_asic/GUI/operation_icons/c.png

b_asic/GUI/operation_icons/c_grey.png

b_asic/GUI/operation_icons/cmul.png

b_asic/GUI/operation_icons/cmul_grey.png

b_asic/GUI/operation_icons/conj.png

b_asic/GUI/operation_icons/conj_grey.png

b_asic/GUI/operation_icons/div.png

b_asic/GUI/operation_icons/div_grey.png

b_asic/GUI/operation_icons/in.png

b_asic/GUI/operation_icons/in_grey.png

b_asic/GUI/operation_icons/mul.png

b_asic/GUI/operation_icons/mul_grey.png