Metadata not displaying for page snapshots

[stakats]

When a new snapshot is added, "accessed" and "URL" should display in under the Info tab

[dstillman]

(In [708]) Closes #252, Metadata not displaying for page snapshots
Closes #304, change references to "website" to "web page"

More changes as per discussions with Dan:

• Linked URLs have been given a second chance at life, though they still shouldn't be used for (most, if any) scrapers (which should use snapshots or the URL field instead)
• Renamed the "website" item type to "webpage"
• Removed "web page" from the New Item menu
• Added Save Link To Current Page toolbar button
• Added toolbar separator between New Item buttons and link/attachment/note to differentiate
• Added limited metadata (URL and accessDate) for attachments
• URL for attachments now stored in itemData (itemAttachments.originalPath is no longer used, but I'm probably not gonna worry about it and just wait for SQLite to support dropping columns with ALTER TABLE) -- getURL() removed in favor of getField('url')
• Snapshots now say "View Snapshot"
• Added Show File button to file attachments to show in filesystem
• Added timed note field to attachments for single notes and adjusted Item.updateNote(), etc. to work with attachments
• Fixed bug with manually bound params in fulltext indexer and Item.save() (execute() vs. executeStep()) -- any recently added items probably aren't in the fulltext index because of this

Known bugs/issues:

• Attachment metadata and notes probably aren't properly imported/exported now (and accessDate definitely isn't)
• Scrapers don't save metadata properly
• Attachment title should be editable
• File attachments could probably use some more metadata (#275, more or less, though they won't be getting tabs)