Added most of 'LD (HL), X' family of methods
Added 'HALT'
Added 'LD (HL), A'
Added 'LD A, X' family of methods
Added 'ADD A, B'
Removed redundant parameters to test helpers
Added some 'ADD A, R' methods
Added 'ADD A, (HL)'
Added 'ADD A, A'
Added most of the 'ADC A, R' family of methods
Added 'ADC A, (HL)'
Added 'ADC A, A'