Add micro version to toolkit version functions

Support micro versions in wxAppTraits::GetToolkitVersion and
wxPlatformInfo functions related to toolkit versions.

interface/wx/platinfo.h

@@ -185,13 +185,12 @@ public:
     bool CheckOSVersion(int major, int minor, int micro = 0) const;
 
     /**
-        Returns @true if the toolkit version is at least @c major.minor.
+        Returns @true if the toolkit version is at least @c major.minor.micro.
 
-        @see GetToolkitMajorVersion(),
-             GetToolkitMinorVersion(), CheckOSVersion()
+        @see GetToolkitMajorVersion(), GetToolkitMinorVersion(),
+             GetToolkitMicroVersion(), CheckOSVersion()
     */
-    bool CheckToolkitVersion(int major, int minor) const;
-    
+    bool CheckToolkitVersion(int major, int minor, int micro = 0) const;
 
     /**
         Returns @true if this instance is fully initialized with valid values.
@@ -417,6 +416,21 @@ public:
     */
     int GetToolkitMinorVersion() const;
     
+    /**
+        Returns the run-time micro version of the toolkit associated with this
+        wxPlatformInfo instance.
+
+        Note that if GetPortId() returns @c wxPORT_BASE, then this value is zero
+        (unless externally modified with SetToolkitVersion()); that is, no native
+        toolkit is in use.
+        See wxAppTraits::GetToolkitVersion() for more info.
+
+        @see CheckToolkitVersion()
+
+        @since 3.1.1
+    */
+    int GetToolkitMicroVersion() const;
+    
     //@}
 
 
@@ -497,7 +511,7 @@ public:
     /**
         Sets the version of the toolkit associated with this wxPlatformInfo instance.
     */
-    void SetToolkitVersion(int major, int minor);
+    void SetToolkitVersion(int major, int minor, int micro = 0);
 
     /**
         Sets the operating system description associated with this wxPlatformInfo instance.