New architecture: BPF (#1388)

* Basic changes of new arch - BPF

* Define some constants

* defined some API methods

* Able to print MISC instruction

* Follow Linux coding style

* Ability to show ALU insn names

* decode return

* Add suite/MC/BPF

* decode jump

* decode store

* decode load

* print instruction done

* try to implement BPF_reg_access

* Implements explicit accessed registers and fix some tiny bugs

* Fix unhandled ja case

* Added BPF_REG_OFF do fix wrong display in jump class

* Great I'm able to decode cBPF with eyes

* Fix: misunderstood the 16-byte instruction's imm

* Add ldxdw

* Add extended-all.cs

* Implements cstest/bpf_getdetail.c

* Fix memory leak

* Add BPF to fuzz

* Implemented regs_read and regs_write

* Fix missing write-access on ALU's dst

* Updated cstool/, test_basic.c, test_detail.c, and test_iter.c

* Updated docs

* Fix type of cs_bpf#operands

* Implements python bindings

* Fix some bugs found by self code review

* Remove dummy tests

* remove typeof

* Address comments

* Fix MSVC's warnings and add test_bpf.py to bindings/python/Makefile

* Fix: call is not offset

HACK.TXT

@@ -7,6 +7,7 @@ Capstone source is organized as followings.
 ├── arch            <- code handling disasm engine for each arch
 │   ├── AArch64     <- ARM64 (aka ARMv8) engine
 │   ├── ARM         <- ARM engine
+│   ├── BPF         <- Berkeley Packet Filter engine
 │   ├── EVM         <- Ethereum engine
 │   ├── M680X       <- M680X engine
 │   ├── M68K        <- M68K engine