Add CHMHelpController, and a wx.HelpController factory function

src/helpchm.sip

@@ -0,0 +1,42 @@
+//--------------------------------------------------------------------------
+// Name:        helpchm.sip
+// Purpose:     SIP wrapper details for wxCHMHelpController
+//
+// Author:      Robin Dunn
+//
+// Created:     02-March-2020
+// Copyright:   (c) 2020 by Total Control Software
+// Licence:     wxWindows license
+//--------------------------------------------------------------------------
+
+
+
+class wxCHMHelpController : public wxHelpControllerBase
+{
+    %TypeHeaderCode
+    #include <wx/msw/helpchm.h>
+    %End
+
+public:
+    wxCHMHelpController(wxWindow* parentWindow = NULL);
+
+    virtual bool Initialize(const wxString& file);
+
+    virtual bool LoadFile(const wxString& file = wxEmptyString);
+    virtual bool DisplayContents();
+    virtual bool DisplaySection(int sectionNo);
+    virtual bool DisplaySection(const wxString& section);
+    virtual bool DisplayBlock(long blockNo);
+    virtual bool DisplayContextPopup(int contextId);
+    virtual bool DisplayTextPopup(const wxString& text, const wxPoint& pos);
+    virtual bool KeywordSearch(const wxString& k,
+                               wxHelpSearchMode mode = wxHELP_SEARCH_ALL);
+    virtual bool Quit();
+
+    wxString GetHelpFile() const;
+
+    static bool ShowContextHelpPopup(const wxString& text,
+                                     const wxPoint& pos,
+                                     wxWindow *window);
+
+};