Version 2.0.0-rc6

This release is expected to be the last RC release of Unicorn2.

Features:

• SystemZ (aka. s390x) support. #1521 #1547
• CPUID hook now may return a bool to indicate whether skipping the CPUID instruction.
• ARM/AARCH64 coprocessor registers read/write support. #889

Fixes/Improvements:

• Rust improvements. More registers enums #1504 Easier to use #1543 #1545
• M68k improvements. #1507
• Golang improvements. Enable uc_ctl_set_model #1506
• Unit tests improvements. #1512
• Various ARM system mode fixes. #1500 #1520 #1525 #1531
• Read/write arm FPSCR and FPSID. #1453
• Fix the support for ARMv8
• Fix a large number of memory leaks and unicorn2 now goes with google/oss-fuzz!
• Add more X87 registers. #1524
• Add more PPC registers.
• Fix the exception not cleared in python bindings. #1537
• Correctly support ARM big endian and drops armeb-softmmu and aarch64eb-softmmu
• Fix ARM CPSR.E not reflected during runtime.
• Resolve fuzzing speed problem on macOS.
• Modernize CmakeFileLists.txt. #1544
• Fix an issue in nested uc_emu_start

Thanks:

@Kritzefitz @zznop @QDucasse @gerph @bet4it @mrexodia @iii-i @jbcayrou @scribam