supporting more cases of simulating user gesture

fix crash on start in WebStorm

this is happening when there is no window context
See https://youtrack.jetbrains.com/issue/WEB-14378

fix crash in window.open in some cases

Merge pull request nwjs#7 from jtg-gg/transparency-rebase

[Transparency] [WIN] force refresh/redraw on transparency changes

honour _blank in nw's new logic for new-win-policy

Fix nwjs/nw.js#2393

filter out frames which is not in devtools jail

Fix nwjs/nw.js#2569

convert to DOM for debugging into Node scripts

Fix nwjs/nw.js#2214

passing nwsnapshot path to v8

Fix nwjs/nw.js#2141

passing nwsnapshot path to v8

Fix nwjs/nw.js#2141

passing nwsnapshot path to v8

Fix nwjs/nw.js#2141