Merge Dependency and Action::Composite into Plan
Some further refactoring of COFF based linkers
Add nullary Commands
Make all command arguments proper lists
Switch from Module::Load to Module::Runtime
Rename GCC linker classes
Allow command preprocessor to return options too
Whitespace fixups
Refactor profile loading
Renamed command to cc/ld
Removed -w from test shebang lines
Dzil bundle update
Split serialize into to_command and to_code