more cleanup of cppinterop vcxproj files.  common section now ready.
move the common parts of cppinterop*.vcxproj into a separate shared file for msbuild to import
finish the rest of the cppinterop platforms
fix some project naming issues that cropped up
fix some build warnings
fix ext.wp81.sl to reference the correct cppinterop project
update todo list
update todo list
fix the sqlite3 vcxproj files to work like the cppinterop ones, thus eliminating that extra log file that was apparently coming from violating the ordering visual C++ expected