[FEATURE REQUEST] Add Search tab to WebUI

[Nerva72]

Please provide the following information

qBittorrent version and Operating System

qBT x64 4.0.3, Windows 7 SP1 x64

If on linux, libtorrent and Qt version

(type here)

What is the problem

There's a useful search function in the actual qBT executable program, but it doesn't seem to be available in the WebUI.

What is the expected behavior

Add "tabs" to the top of the WebUI interface that resemble the executable version, with tabs for "Transfers" and "Search" (and if you want, add the tabs for "Execution Log" and "RSS" as well).

Steps to reproduce

(type here)

Extra info(if any)

(type here)

[ngosang]

Duplicate of #859