Dynamic search (with hidding of not relevant fields) via input:text

[versusbassz]

Implemented features

• [x] search by fields: meta_id, key, value
• [x] a query and a row content are matched in lower case
• [x] rows without a query are hidden
• [x] don't send a form on pressed "Enter" key
• [x] don't break sorting, "pretty values"

What is left for the future

• highlight found queries in rows

[versusbassz]

Done.
Also added notes about features to the Wiki.