Handle modifier keys differently to avoid Apple flagging us as wishing to monitor input from other applications

Fixes #291

proj/vs2017/Common/Common.vcxproj

@@ -408,6 +408,7 @@
     <ClCompile Include="..\..\..\src\tools\menu_accel.win.cpp" />
     <ClCompile Include="..\..\..\src\tools\prefs.win.cpp" />
     <ClCompile Include="..\..\..\src\tools\undo.cpp" />
+    <ClCompile Include="..\..\..\src\tools\keymods.cpp" />
     <ClCompile Include="..\..\..\src\tools\winutil.win.cpp" />
     <ClCompile Include="..\..\..\src\universe\creature.cpp" />
     <ClCompile Include="..\..\..\src\universe\living.cpp" />
@@ -497,6 +498,7 @@
     <ClInclude Include="..\..\..\src\tools\prefs.hpp" />
     <ClInclude Include="..\..\..\src\tools\undo.hpp" />
     <ClInclude Include="..\..\..\src\tools\vector2d.hpp" />
+    <ClInclude Include="..\..\..\src\tools\keymods.hpp" />
     <ClInclude Include="..\..\..\src\tools\winutil.hpp" />
     <ClInclude Include="..\..\..\src\universe\creature.hpp" />
     <ClInclude Include="..\..\..\src\universe\living.hpp" />

proj/vs2017/Common/Common.vcxproj.filters

@@ -689,6 +689,9 @@
     <ClCompile Include="..\..\..\src\tools\undo.cpp">
       <Filter>Tools</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\..\src\tools\keymods.cpp">
+      <Filter>Tools</Filter>
+    </ClCompile>
     <ClCompile Include="..\..\..\src\tools\winutil.win.cpp">
       <Filter>Tools</Filter>
     </ClCompile>
@@ -915,6 +918,9 @@
     <ClInclude Include="..\..\..\src\tools\vector2d.hpp">
       <Filter>Tools</Filter>
     </ClInclude>
+    <ClInclude Include="..\..\..\src\tools\keymods.hpp">
+      <Filter>Tools</Filter>
+    </ClInclude>
     <ClInclude Include="..\..\..\src\tools\winutil.hpp">
       <Filter>Tools</Filter>
     </ClInclude>