Use a property grid to display command line options

Description:

Currently, if a user wants more than the standard command-line options that are always used, they have to know what those options are and then add them to one of the flag entries. As an alternative, we could use a property grid with three panels for common, debug, and release. Each panel would contain categories, and list the options in each category.

Note that this is a large undertaking -- we have to be able to accurately parse a command line, setup a property grid system that is flexible enough the future categories and options can easily be added, avoid conflicts between common flags versus debug/release flags, etc. Once completed for MSVC and clang-cl, it would also be a useful way to start support gcc/clang.