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/CMemRegion.cls

@@ -0,0 +1,50 @@
+VERSION 1.0 CLASS
+BEGIN
+  MultiUse = -1  'True
+  Persistable = 0  'NotPersistable
+  DataBindingBehavior = 0  'vbNone
+  DataSourceBehavior  = 0  'vbNone
+  MTSTransactionMode  = 0  'NotAnMTSObject
+END
+Attribute VB_Name = "CMemRegion"
+Attribute VB_GlobalNameSpace = False
+Attribute VB_Creatable = True
+Attribute VB_PredeclaredId = False
+Attribute VB_Exposed = False
+'this is for 32bit address space..
+Public address As Long
+Public size As Long
+Public endsAt As Long
+Public perm As Long
+
+Function toString() As String
+    toString = "Addr: " & Hex(address) & " Size: " & Hex(size) & " Perm: " & permToString() & " (" & Hex(perm) & ")"
+End Function
+
+'Public Enum uc_prot
+'    UC_PROT_NONE = 0
+'    UC_PROT_READ = 1
+'    UC_PROT_WRITE = 2
+'    UC_PROT_EXEC = 4
+'    UC_PROT_ALL = 7
+'End Enum
+
+Function permToString() As String
+    
+    If perm = 7 Then
+        permToString = "All"
+        Exit Function
+    End If
+    
+    If perm = 0 Then
+        permToString = "None"
+        Exit Function
+    End If
+    
+    If (perm And 1) = 1 Then permToString = "Read "
+    If (perm And 2) = 2 Then permToString = permToString & "Write "
+    If (perm And 4) = 4 Then permToString = permToString & "Exec"
+    
+    permToString = Trim(permToString)
+    
+End Function