in addition to 'invalid' instruction

BUG: mips32 uc map 0x9000000 become 0x1000000

Add new class AnalOp and Operand
@Property r2.offset returns current offset

New methods of R2:
write(addr: int, bs: bytes)
get_fcn_at(addr: int) -> Function
get_bb_at(addr: int) -> BasicBlock
get_fcn_bbs(addr: int) -> List[BasicBlock]
dis(Function | BasicBlock) -> List[Instruction]

New attributes of R2Data:
__str__ can hexlify int
__contains__  makes range checking easier
@Property: start_ea, end_ea

Fix an error in @aaa decorator to accept args

example deflat_r2.py tests a x86 program compiled with OLLVM -mllvm -fla

see https://blog.quarkslab.com/deobfuscation-recovering-an-ollvm-protected-program.html

assert_mem_equal is only needed for R2Qiling

refactor r2._cmd() to allow optional r_core passed

@wrap_arg_addr makes function accept name/R2Data as addr and return same func when args is empty

rename: get_fcn_at -> get_fcn
rename: get_bb_at -> get_bb

r2.shell() can now be launched at an address (PC by default)

only difference: use an extra dict cmap to store ctype buf

map_info is the same as existing, no bytearray stored and updated