[profiles/package.mask] Mask kde-frameworks/kf-env-3.
[kde-frameworks/kf-env] Version bump.

This removes all custom Qt paths. QT_PLUGIN_PATH is unnecessary as of ECM-1.2.0
and QML2_IMPORT_PATH as of 1.3.0.

Masked for now because it requires ECM-1.3.0 to be released and then all revdeps
to be rebuilt.

Package-Manager: portage-2.2.10