Add windows search functionality

[reinismu]

First thing what I wanted is windows search so I made simplest one I could. I did come by some bugs so I set Index to be one way and added some todos in code. Feel free to code review it and give your feedback.

[reinismu]

Ohh just noticed that feature pull requests are not accepted. Well I guess it can stay here if someone wants window switching feature

[CLAassistant]

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