Big change: Introduced new mechanism to handle queries. It should not cause any visible changes ATM apart from fixing several long-standing bugs realted to handling post-visit/battle/levelup callback, including infamous creature bank issues: #955, #1053, #1063, #1191. Needs testing.

Minor changes:
* default log level set to trace
* LOG_TRACE raii guardian lifetime will last till the end of block
* compile fixes
* minor refactorings

server/VCMI_server.vcxproj

@@ -145,6 +145,7 @@
   </ItemDefinitionGroup>
   <ItemGroup>
     <ClCompile Include="CGameHandler.cpp" />
+    <ClCompile Include="CQuery.cpp" />
     <ClCompile Include="CVCMIServer.cpp" />
     <ClCompile Include="NetPacksServer.cpp" />
     <ClCompile Include="StdInc.cpp">
@@ -158,6 +159,7 @@
   <ItemGroup>
     <ClInclude Include="..\Global.h" />
     <ClInclude Include="CGameHandler.h" />
+    <ClInclude Include="CQuery.h" />
     <ClInclude Include="CVCMIServer.h" />
     <ClInclude Include="StdInc.h" />
   </ItemGroup>