Read settings.xml to locate local repository

[elharo]

RepositoryUtility.findLocalRepository should read settings.xml to locate local repository

http://maven.apache.org/settings.html#Simple_Values

[suztomo]

Note for myself:

There are two locations where a settings.xml file may live:

The Maven install: ${maven.home}/conf/settings.xml
A user’s install: ${user.home}/.m2/settings.xml

Mvn command has "-s" option to specify settings.xml

[elharo]

From Mikhail Istria:

I didn't find a good code for that. It looks like MavenCli and related
classes are doing most of the job, but they're not so useful as API because
a lot of their goodness is private.
See how we do it in LemMinX-Maven in the meantime: reading settings, then
fallback to system property, then fallback to default location:
https://github.com/eclipse/lemminx-maven/blob/master/lemminx-maven/src/main/java/org/eclipse/lemminx/maven/MavenPlugin.java#L117...L129