JBIDE-16870 - Remove "Tech Preview" designation from Hybrid Mobile Tools and CordovaSim

removes tech preview from feaure.properties
JBIDE-17436 - Hints for id and name fields 

Adds messages to id and name fields on new Hybrid project wizard.
JBIDE-17482 - Listing of the Cordova plugins do not work behind a proxy

Carry proxy setting to HttpClient when making calls for retrieving data from cordova registry.
handle unconfigured proxies

handles the case when a proxy can not be determined
CordovaSim is not launched on Linux with GTK3 and Oracle JVM

fixed