Style cleanup.

* Clean-up floating ternary operator.
* Line length.
* Remove empty space at bottom of style config dialog.
* Remove outdated sample XML config.

Change-Id: Id6911abdee075915f644c71bccf4a4668437bd62
Add ability to export/import VR plugin configuration from file.

This allows a minimial pvsm-style file to be written that contains
the VR plugin state.

The "proxyName" attribute has been added to the <Style ...> tags
that can be used to lookup a proxy by name, since the pvvr file
won't contain any information to map the proxy id into a usable
object.

Change-Id: I08891cd9664f70bfad5b32dd1b00fa451158c837
Merge topic '13939-vr-cache-state' into next

60662e3 Add ability to export/import VR plugin configuration from file.
962c16d Style cleanup.