New signature "preview" table in "Signature reader" dialog

[exodus4d]

Description:

Whenever the "signature module" is updated with fresh scan results from the EVE client (clipboard paste), the user should get a preview of the parsed signatures and see potential changes made to the signature table before actually submit it.

Features:

• New read only copy of the current signature table added to "signature reader" dialog
• Any change (paste) in "Scan result" <textarea> field, triggers a redraw of that preview table.
  • Added signature rows are highlighted (green background color)
  • Changed signature columns are highlighted (orange background color)
  • Deleted signature rows (require an active "lazy delete" checkbox) are highlighted (red background color)
• Any change in the underlaying primary signature table (e.g. from other users) will also result in a redraw of that preview table
• New info label added, shows the found/parsed signature count
• New counter labels added, with counts for added/changed/deleted signatures

[CalMatar]

I love love this. Can't wait for this one to be implemented.