Updated locationbar options

https://bugzilla.mozilla.org/show_bug.cgi?id=530209
Combined urlbar options in one tab
Fixed signon.autofillForms option key
Removed obsolete option browser.popups.showPopupBlocker
Removed option accessibility.warn_on_browsewithcaret
Removed obsolete option html5.enable
Removed obsolete option mozilla.widget.render-mode
Removed obsolete option gfx.3d_video.enabled
Removed master password related options

Removed security.ask_for_password and security.password_lifetime
Removed obsolete option browser.bookmarks.livemark_refresh_seconds
Removed notification related options

Remove update.showSlidingNotification,
browser.download.manager.showAlertOnComplete and
browser.download.manager.showAlertInterval
Removed download-manager related options

Removed browser.download.manager.focusWhenStarting and
browser.download.manager.quitBehavior
Removed notification related options

Removed alerts.slideIncrement, alerts.slideIncrementTime and
alerts.totalOpenTime
Removed obsolete option browser.identity.ssl_domain_display
Removed obsolete option browser.blink_allowed
Removed obsolete option browser.frames.enabled
Removed obsolete option browser.allTabs.previews
Removed unnecessary default value in option definition
Removed network related options

Removed network.http.keep-alive and
network.http.max-connections-per-server
Updated name and description for devtools.inspector.enabled