Graphical customazation + fix drawing issue

[albinpoignot]

Technical point of view :

• Add attrs to be used in BarcodeScannerView
• Pass the new attrs to ViewFinderView
• Fix drawing lines issues (small offset on each corners due to the way Paint works)

Functionnal point of view :

• Add graphical customization from the XML inflation of BarcodeScannerView
• Fix corners drawing issue (small offset on each corner)

[dm77]

Ah this is a good one. Has been on list of todos for 2.0 release that I have been holding back for a while now. Will merge this in with my changes. Thank you for this.

[albinpoignot]

I just used Path instead of drawLine.It allows me to make rounded corners and potentially other customizations. You could wait a little longer until I pushed it before merging if you want too :)

[albinpoignot]

Can one of the admin review this patch ?

[dm77]

@albinpoignot This is now available in v1.9.3. Thank you so much:
a.) for waiting on me for 2 months to merge this commit
b.) for adding this very useful customization feature

Sorry for any trouble I caused you