Project.autoSettings accepts a sequence of AddSettings, instances of which
are constructed from methods in AddSettings. The configurable settings
are per-user settings (from ~/.sbt, for example), settings from .sbt files,
and plugin settings (project-level only). The order in which these instances
are provided to autoSettings determines the order in which they are appended
to the settings explicitly provided in Project.settings.
For .sbt files, defaultSbtFiles adds the settings from all .sbt files in the
project's base directory as usual. AddSettings.sbtFiles accepts a sequence
of Files that will be loaded according to the standard .sbt format. Relative
Files are resolved against the project's base directory.
Plugin settings may be included on a per-Plugin basis by using the plugins
method and passing a Plugin => Boolean. The settings controlled here are
only the automatic per-project settings. Per-build and global settings will
always be included.
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