Improve file support and misc changes

[bobg]

Add Glob. Add better support for directories in Files. Make YAMLStringList and YAMLStringListFromNodes into methods on Controller and make them take a dir argument. Sprinkle in some missing calls to con.JoinPath.

[github-actions]

Pull Request Test Coverage Report for Build 5069567017

• 47 of 58 (81.03%) changed or added relevant lines in 6 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.2%) to 74.15%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
yaml.go	6	7	85.71%
proto/proto.go	0	2	0.0%
files.go	34	42	80.95%

Totals
Change from base Build 4973553730:	0.2%
Covered Lines:	1701
Relevant Lines:	2294

---

💛 - Coveralls

[github-actions]

Modver result

This report was generated by Modver,
a Go package and command that helps you obey semantic versioning rules in your Go module.

This PR requires an increase in your module’s major version number.
If the new major version number is 2 or greater,
you must also add or update the version suffix
on the module path defined in your go.mod file.
See the Go Modules Reference for more info.

checking RegisterYAMLStringList
  in parameters of func(name string, fn func(*gopkg.in/yaml.v3.Node) ([]string, error))
    in parameters of func(*gopkg.in/yaml.v3.Node) ([]string, error)
      1 param(s) to 3
        Major