Refactor the dialog engine's event handling to make it easier to add new events in the future

- Focus event split into focus and defocus
- Scroll event added but not yet properly implemented

Also:
- Remove the useless (and ignored) clickable attributes from the schema
- Pave the way for controls other than fields to be able to recieve keyboard focus

src/BoE.vsproj/Common/Common.vcxproj

@@ -36,6 +36,7 @@
     <ClInclude Include="..\..\dialogxml\control.hpp" />
     <ClInclude Include="..\..\dialogxml\dialog.hpp" />
     <ClInclude Include="..\..\dialogxml\dialog.keys.hpp" />
+    <ClInclude Include="..\..\dialogxml\dlogevt.hpp" />
     <ClInclude Include="..\..\dialogxml\dlogutil.buttons.hpp" />
     <ClInclude Include="..\..\dialogxml\dlogutil.hpp" />
     <ClInclude Include="..\..\dialogxml\field.hpp" />

src/BoE.vsproj/Common/Common.vcxproj.filters

@@ -130,6 +130,9 @@
     <ClInclude Include="..\..\dialogxml\dialog.keys.hpp">
       <Filter>DialogXML\Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\dialogxml\dlogevt.hpp">
+      <Filter>DialogXML\Header Files</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\dialogxml\dlogutil.buttons.hpp">
       <Filter>DialogXML\Header Files</Filter>
     </ClInclude>