Added test for `ADD HL, DE`
Added `LD A, (DE)`
Added test for `DEC DE`
Added test for `INC E`
Added test for `DEC E`
Added test for `LD E, n`
Added test for `RR A`
Added test for `JR NZ, n`
Added `LD HL, nn`
Added `LD (HLI), A`
Added test for `INC HL`
Added test for `INC H`
Added test for `DEC H`
Added test for `LD H, n`
Added `DAA`