Merge the Code Scanner implementations UI to look the same

The glass-code-scanner and glass-native-code-reader perform (more or less) the same function. to scan codes, but they have a very different look to them

Merge the 2 UIs:

• use the CSS frame from glass-native-code-reader' (this means we can get rid of the canvas drawn elements in glass-code-scanner
• implement the verification mechanism in glass-code-scanner for both (this icons showing according the the results)

For the glass-code-scanner add an option to hide the navigation between code scanner and input (that would mean that if that flag is on, when an input type is selected, it cannot be changed via UI)

related to glass-wallet#35