VB6 bindings and dynload update w/ uc_context* and uc_free api,… (#715)

* msvc unicorn.def and dynload.c added new uc_context* and uc_free api, includes support for older dlls compiled with uc_context_free (can remove next binary release)

* vb6 bindings & x86 32bit sample class for unicorn

bindings/vb6/README.txt

@@ -0,0 +1,71 @@
+
+Unicorn engine bindings for VB6 
+
+A sample class for the 32bit x86 emulator is provided.
+
+Contributed by: FireEye FLARE team
+Author:         David Zimmer <david.zimmer@fireeye.com>, <dzzie@yahoo.com>
+License:        Apache
+
+' supported api: 
+'        ucs_version
+'        ucs_arch_supported
+'        ucs_open
+'        ucs_close
+'        uc_reg_write
+'        uc_reg_read
+'        uc_mem_write
+'        UC_MEM_READ
+'        uc_emu_start
+'        uc_emu_stop
+'        ucs_hook_add
+'        uc_mem_map
+'        uc_hook_del
+'        uc_mem_regions
+'        uc_mem_map_ptr
+'        uc_context_alloc
+'        uc_free
+'        uc_context_save
+'        uc_context_restore
+'        uc_mem_unmap
+'        uc_mem_protect
+'        uc_strerror
+'        uc_errno
+'
+' supported hooks:
+'        UC_HOOK_CODE
+'        UC_HOOK_BLOCK
+'        memory READ/WRITE/FETCH
+'        invalid memory access
+'        interrupts
+'
+' bonus:
+'        disasm_addr     (conditional compile - uses libdasm)
+'        mem_write_block (map and write data auto handles alignment)
+'        get_memMap      (wrapper for uc_mem_regions)
+'
+
+dependancies: (all in same directory or unicorn package in %windir%)
+   vb6Test.exe
+     ucvbshim.dll           _
+       unicorn.dll           -
+         libgcc_s_dw2-1.dll   \
+         libiconv-2.dll        \__ unicorn package
+         libintl-8.dll         /
+         libpcre-1.dll        /
+         libwinpthread-1.dll_-
+
+Notes:
+
+   c dll was built using VS2008
+   build notes are included at the top of main.c
+   this dll serves as a stdcall shim so vb6 can access the cdecl api and receive data from the callbacks.
+ 
+   huge thanks to the unicorn and qemu authors who took on a gigantic task to create this library!
+
+
+   
+
+   
+
+