Store all constants in one file

[denispapakul]

I suggest storing all constants in one file in order to avoid code repetition and to use re-use of variables. This problem looks like this -

Can implement it.

[tremblerz]

Do you want to take it on? We'll assign it you

[denispapakul]

Sure, yes, I will implement it.

[jpomazal]

Just a comment on this, width isn't inherently a constant. If screen orientation changes, or if app goes side-by-side, etc. that could change.

To make it more compatible we should probably use a HOC, library or similar where needed and pull references to width out of static styles and change to style={[style.baseStyle,{width:...]} where needed, although we might want to consider removing static references in general and use alternative layout strategies.