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/Project1.vbp

@@ -0,0 +1,42 @@
+Type=Exe
+Form=Form1.frm
+Reference=*\G{00020430-0000-0000-C000-000000000046}#2.0#0#C:\WINDOWS\system32\stdole2.tlb#OLE Automation
+Module=uc_def; uc_def.bas
+Module=misc; misc.bas
+Class=ucIntel32; ucIntel32.cls
+Class=CMemRegion; CMemRegion.cls
+IconForm="Form1"
+Startup="Form1"
+HelpFile=""
+ExeName32="vb6Test.exe"
+Command32=""
+Name="Project1"
+HelpContextID="0"
+CompatibleMode="0"
+MajorVer=1
+MinorVer=0
+RevisionVer=0
+AutoIncrementVer=0
+ServerSupportFiles=0
+VersionCompanyName="sandsprite"
+CompilationType=0
+OptimizationType=0
+FavorPentiumPro(tm)=0
+CodeViewDebugInfo=-1
+NoAliasing=0
+BoundsCheck=0
+OverflowCheck=0
+FlPointCheck=0
+FDIVCheck=0
+UnroundedFP=0
+StartMode=0
+Unattended=0
+Retained=0
+ThreadPerObject=0
+MaxNumberOfThreads=1
+
+[MS Transaction Server]
+AutoRefresh=1
+
+[fastBuild]
+fullPath=%ap%\vb6Test.exe