[db] Modifed the way grep outputs are saved and searched

+ A new table grep_outputs is added to schema
+ All unique grep matches are saved in that table
+ A many-to-many relationship is established between the grep matches and transactions table
+ Only transaction per unique match is fetched when requested
[proxy] Changed run to pseudo_run

+ Loggers from parent process are available to children, so inorder to remove console logging reliably, proxy process is created like any other owtf process
[interface] Added a jquery spinner to indicate the loading of plugin report. This will help user to understand that operation is in progress
[interface] Added spinner to transaction log, to indicate when search is happening