Added posibility to scan barcodes on input

[PavelShelekhin]

Right now it is not possible to scan barcode on input, text area or other editable field. This change should allow some users to use it with those fields.

[warnwar]

@kybarg If I'm reading this code correctly, this looks like something I could use as well. Is there any chance of getting this merged?

[kybarg]

@warnwar will look into it this week

[warnwar]

@kybarg Have you had a chance to look at this? My project could really use it.