fix(config)!: multiple paths in config profile as array

[aawsome]

-- BREAKING CHANG --

Using multiple paths for a sources in the config file caused many problems as the syntax was unclear and problems existed in edge cases.

This PR changes the definition of sources in config profile files:

• a single path path can be specified as before, i.e. using source = "/my/path".
• multiple paths must now be given in an array:

source = ["/my/path1", "/my/path2"]

Note that

source = "/my/path1 /my/path2"

is now interpreted a a single path using the dir-tree "my","path1 " (with space), "my", "path2".

closes #1122
closes #1094

[aawsome]

LGTM