[NXCM-5233] Add settings resource (retrieves divers settings about Nexus)

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
[NXCM-5233] Also load Nexus settings when status is loaded & disable Nexus pinging when "keepAlive" is false

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
Merge pull request #205 from sonatype/NXCM-5233-no-session-timeout

REVIEW: [NXCM-5233] Introduce property to enable/disable session timeout from UI
NEXUS-6047: DirSupport got mkdir

That honors symlinks to directories too.
NEXUS-6047: Renamed method and removed Files.createDirectories usage

And redirected to new method.
Merge pull request #209 from sonatype/NEXUS-6047-mkdir-symlink

NEXUS-6047: DirSupport got mkdir
Deprecated old content resource.
Merge remote-tracking branch 'origin/master' into NEXUS-6019-clm-timeout
NEXUs-6019: Use mkdir and prefer composition better

Using mkdir from core, and Modello specific versioning
moved into helper, usable for modello models but not forcing
you to extend it.