Initial support of pf structs for PDB

- some initial work for build format flag
- add comment with types that need to add
- refactor and support of pf structs
Make .a2f work (fix afbb and such)
Add periodic table cheatsheet and update a2f a bit
Fix fail address on x86capstone
Use proper binmain address in 'aa'
Fix memleak in x86.cs using the iter api

- Remove unused custom alloc code
- Call plugin destructor in RAsm fini method
Update capstone from git
Enforce entry0 and main function names in 'aa'
Fix bigendian pointer dereference
Fix segfault in RAsm.fini and disable iter api for arm.cs
Fix crash in x86.cs, handle ^C in /r and fix refptrs in disasm
Update SDB and remove wip sdb helpers from core-anal