[feat] finish implementing legal 6502 opcodes

[j1nxie]

there are a lot of opcodes missing up until this point.

this issue will double up as a checklist for opcodes that i have implemented.

• [x] ADC
• [x] AND
• [x] ASL
• [x] BCC
• [x] BCS
• [x] BEQ
• [x] BIT
• [x] BMI
• [x] BNE
• [x] BPL
• [x] BRK
• [x] BVC
• [x] BVS
• [x] CLC
• [x] CLD
• [x] CLI
• [x] CLV
• [x] CMP
• [x] CPX
• [x] CPY
• [x] DEC
• [x] DEX
• [x] DEY
• [x] EOR
• [x] INC
• [x] INX
• [x] INY
• [x] JMP
• [x] JSR
• [x] LDA
• [x] LDX
• [x] LDY
• [x] LSR
• [x] NOP
• [x] ORA
• [x] PHA
• [x] PHP
• [x] PLA
• [x] PLP
• [x] ROL
• [x] ROR
• [x] RTI
• [x] RTS
• [x] SBC
• [x] SEC
• [x] SED
• [x] SEI
• [x] STA
• [x] STX
• [x] STY
• [x] TAX
• [x] TAY
• [x] TSX
• [x] TXA
• [x] TXS
• [x] TYA

[j1nxie]

finally done with e8e4512.