* fix typo in anal_arm esil (does not affect esil execution)
* add af flag setting and sof op for sub overflow, change borrow
* remove the break that was 'breaking' everything, fix warning
* add new sign extension operator and use it to handle signedness in imul
* work on expressions for idiv, div, imul, mul, remove and just modify sub/cmp
* add clz and reorder the sign extension arguments to be in line with all other ops
* add support for many arm64 instructions
* add sign extension to all ldr*s instructions
* make numerous changes to fix REV*, SXT*, LSL, LSR, ASR, SDIV, MOVN and others, to be detailed in PR
* add sxt* to shifted_register_append, use it to fix opcall and ldr / str
* remove unnecessary commented code
* add some comments
* add clz and reorder the sign extension arguments to be in line with all other ops
* add sign extension to all ldr*s instructions
* make numerous changes to fix REV*, SXT*, LSL, LSR, ASR, SDIV, MOVN and others, to be detailed in PR
* add sxt* to shifted_register_append, use it to fix opcall and ldr / str
* fix wrong type check in esil_signext
* change borrow flag back to the way it was
* add example comment to esil_signext
* unbreak movk
* format mask in sub, cmp, and movk as hex
* add test for esil signext operator
* use ULL instead of (ut64) cast in shifts
