Highlights of v2.0.0

This is the first major upgrade to BuildAMation since the initial release.

New features

Targets .NET Core 2.1.
C#7 language usage.
Completely rewritten package dependency evaluation in the Core assembly.
NuGets can now be used by package scripts.
Settings toolchain mapping simplified and moved to attribute markup.
Package sources can be automatically downloaded.
Separated the preprocessor tool from the compiler in the C package.
API simplification and streamlining. (These are breaking changes to the APIs.)
Xcode 10 and 11.
Gcc 6, 7, 8, 9.
VisualStudio 2019
Documented everything.
Revamped continuous integration with AppVeyor and TravisCI to massively improve coverage.