Rewrite GPL-only code

[XVilka]

To become compatible with LGPL and other licenses, allowing Rizin library to be used anywhere.

Disassemblers

• SH librz/asm/arch/sh/gnu by @DMaroo, see [RzIL] IL lifting of SuperH ISA #2518
• Tricore librz/asm/arch/tricore/gnu by @imbillow, see Capstone@next TriCore #3463
• NIOS (REMOVED) librz/asm/arch/nios/gnu - could be done with capstone auto-sync and this unofficial LLVM port: https://github.com/ivanllopard/nios2-llvm/tree/master/lib/Target/Nios2
• Xtensa librz/asm/arch/xtensa/gnu by @imbillow Add Xtensa arch support #4654
• SPARC librz/asm/arch/sparc/gnu by @Rot127 and @DMaroo to be targeted by capstone llvm-sync
• ARC librz/asm/arch/arc/gnu depends on Add ARC auto-sync architecture capstone-engine/capstone#2570
• LANAI librz/asm/arch/lanai/gnu to be targeted by capstone llvm-sync (see also https://q3k.org/lanai.html)
• CRIS librz/asm/arch/cris/gnu
• HPPA (PARISC) librz/asm/arch/hppa/gnu - by @XVilka (HP PA-RISC: Migrate to Capstone and add basic analysis #4469)
• VAX librz/asm/arch/vax/ - by @XVilka (rewrite it from scratch)