next: Imports

## Packages

A CUE file is a standalone file by default. A package clause allows a single configuration to be split across multiple files.

The configuration for a package is defined by the concatenation of all its files, after stripping the package clauses and not considering imports.

Duplicate definitions are treated analogously to duplicate definitions within the same file. The order in which files are loaded is undefined, but any order will result in the same outcome, given that order does not matter.

a.cue

package config

foo: 100
bar: int

b.cue

package config

bar: 200

\$ cue eval a.cue b.cue

foo: 100
bar: 200