Add cs_insn_flags. Breaking API change.

[numas13]

Replace cs_insn.is_alias and cs_insn.usesAliasDetails with bitflags.

Your checklist for this pull request

• [x] I've documented or updated the documentation of every API function and struct this PR changes.
• [ ] I've added tests that prove my fix is effective or that my feature works (if possible)

Detailed description

Add instruction bitflags with reserved range for arch-specific usage. For example:

• E2K speculative mode execution.
• IA-64 "stop bits".
• You name it.

This information is critical and must be present even if instruction details is off.

But I'm not sure how many bitflags should be arch-specific.

Test plan

Update bindings and user software.

[numas13]

I'm closing PRs. We'll think about what can be done.