Updated definition of `INC B`
Added test for `DEC B`
Updated definition of `DEC B`
Added `LD B, n` test
Updated `LD B, n`
Added `RLCA` test
Added `LD (nn), SP`
Added test for `ADD HL, BC`
Added test for `LD A, (BC)`
Added test for `DEC BC`
Added test for `INC C`
Added test for `DEC C`
Added test for `LD C, n`