2.3.0.201805031634: Remove root package-lock.json

Signed-off-by: Yannick Schaus <habpanel@schaus.net>

2.3.0.201804120154: Gzip resources; optional rule engine dependency

- Add an option to serve prebuilt gzipped web app
  resources and add a Content-encoding: gzip header
  to the response.  This reduces significantly the
  initial download size of the web app. Enable in
  Paper UI (Configuration > Services > UI > HABot).

  NOTE: myopenhab.org/openHAB Cloud does NOT support
  reverse proxifying with Content-encoding: gzip, so
  enabling option will NOT work with this service.
  Use your own reverse proxy (ie. nginx) or another
  method.

- Make the dependency to the rule engine optional
  (org.eclipse.smarthome.automation). The action
  type module will be enabled only if the automation
  engine bundles are already installed.

- HbBtn: fix command expression parsing

- Small cleanups in Javadoc & quasar.conf.js.

Signed-off-by: Yannick Schaus <habpanel@schaus.net>

2.3.0.201804102234: New component: HbSelect

Use ConfigExpr control for 'expr' configDescriptions
(support booleans and arrays)

Signed-off-by: Yannick Schaus <habpanel@schaus.net>

2.3.0.201804102035: Fix infinite redirect when offline

Signed-off-by: Yannick Schaus <habpanel@schaus.net>

2.3.0.201804102020: Fix infinite redirect when offline

Signed-off-by: Yannick Schaus <habpanel@schaus.net>

2.3.0.201804101921: Show a 'offline' page when the initial load fails

Signed-off-by: Yannick Schaus <habpanel@schaus.net>

2.3.0.201804101655: Handle event source disconnections & items updates

Signed-off-by: Yannick Schaus <habpanel@schaus.net>

2.3.0.201804101507: Designer minor improvements

- fix tree width if overflow
- JSON editor format button
- Paste menu option disable/label

Signed-off-by: Yannick Schaus <habpanel@schaus.net>

2.3.0.201804101245: Card Designer feature improvements

- Tool pane changed to tabbed layout + contextual menu
- Allow copy/pasting a component in a different
  slot, including another card (standard keyboard
  shortcuts supported - Ctrl+X/C/V or Cmd+X/C/V)
- JSON editor with basic validation to edit slots
  directly
- HbBtn: accept expressions for command, icons

Signed-off-by: Yannick Schaus <habpanel@schaus.net>

2.3.0.201804052047: Add a check and logging to address #9.

Signed-off-by: Yannick Schaus <habpanel@schaus.net>