Initial commit
AVR core created, two register instructions implemented
Added arithmetic one register instructions to core
Added address space interface
TODO comments added for every AVR instruction not yet implemented in core
Core: Implemented additional 1-operand instructions and ADIW/SBIW
Core: Added some register-immediate instructions
Core: Changed every arithmetic right shift to logic right shift, possibly preventing future bugs
Core: Reordered parameters, renamed helper methods
Core: Implemented compare and subtract with immediate
Core: Implemented multiply instructions
Core: Implemented SREG bit set/clear instructions
Core: Implemented T bit instructions
Core: Helpers for memory access added, special case SREG considered
Core: Deleted TODO comments for SREG operations
Core: Deleted TODO comment for NOP, already implemented inline
Core: Implemented LD/ST
Core: Implemented LDD/STD
Core: Implemented MOVW
Core: Implemented LDI