added support for paths with spaces for VSBUILDS

There was a problem with MSBuild in that windows file paths
end with a backslash, which was escaping the last of the double quotes which
surround the $(ProjectDir) directive. This was fixed by removing the
last backslash through changing it to $(ProjectDir.TrimEnd('\')).

methods.py

@@ -1710,9 +1710,13 @@ def generate_vs_project(env, num_jobs):
         env.AddToVSProject(env.servers_sources)
         env.AddToVSProject(env.editor_sources)
 
-        env['MSVSBUILDCOM'] = build_commandline('scons --directory="$(ProjectDir)" platform=windows target=$(Configuration) tools=!tools! -j' + str(num_jobs))
-        env['MSVSREBUILDCOM'] = build_commandline('scons --directory="$(ProjectDir)" platform=windows target=$(Configuration) tools=!tools! vsproj=yes -j' + str(num_jobs))
-        env['MSVSCLEANCOM'] = build_commandline('scons --directory="$(ProjectDir)" --clean platform=windows target=$(Configuration) tools=!tools! -j' + str(num_jobs))
+        # windows allows us to have spaces in paths, so we need
+        # to double quote off the directory. However, the path ends
+        # in a backslash, so we need to remove this, lest it escape the
+        # last double quote off, confusing MSBuild
+        env['MSVSBUILDCOM'] = build_commandline('scons --directory="$(ProjectDir.TrimEnd(\'\\\'))" platform=windows target=$(Configuration) tools=!tools! -j' + str(num_jobs))
+        env['MSVSREBUILDCOM'] = build_commandline('scons --directory="$(ProjectDir.TrimEnd(\'\\\'))" platform=windows target=$(Configuration) tools=!tools! vsproj=yes -j' + str(num_jobs))
+        env['MSVSCLEANCOM'] = build_commandline('scons --directory="$(ProjectDir.TrimEnd(\'\\\'))" --clean platform=windows target=$(Configuration) tools=!tools! -j' + str(num_jobs))
 
         # This version information (Win32, x64, Debug, Release, Release_Debug seems to be
         # required for Visual Studio to understand that it needs to generate an NMAKE