Add project 6 skeleton files, reorganize

FINISH COMPUTER!!!

Fix incorrect D register load logic

Correct actual jump logic, pass CPU.tst

Fix jump logic to check C-instruction

Implement most of CPU.hdl

Implement Memory.hdl, add PROGRESS.md

Write optimized/semi-unrolled Fill, add comments

Remove 2 instructions in BLACK_SCREEN

Add project 5 skeleton files

Re-do Fill.asm (TODO optimize later)

Re-do Mult.asm

Add project 4 skeleton files

Re-do RAM512.hdl, RAM4K.hdl, and RAM16K.hdl

Re-do RAM8.hdl and RAM64.hdl

Re-do Bit.hdl, PC.hdl, and Register.hdl

Add project 3 skeleton files

Re-do ALU.hdl

Re-do Add16.hdl and Inc16.hdl

Re-do HalfAdder.hdl and FullAdder.hdl

Add project 2 skeleton files

Re-do And16.hdl, Not16.hdl, Or16.hdl, Or8Way.hdl

Re-do DMux4Way.hdl and DMux8Way.hdl

Re-do Mux4Way16.hdl and Mux8Way16.hdl

Re-do Mux.hdl, DMux.hdl, and Mux16.hdl

Re-do And.hdl, Not,hdl, Or.hdl, and Xor.hdl

Add README.md and PROGRESS.md

Initial commit, add project skeleton files