Use Ubuntu.Components 1.3 features

[krnekhelesh]

Ubuntu.Components 1.3 brings a host of new components that help with list item performance and more adaptable page headers. This pull request implements the following,

• Migrated CustomListItem to ListItemLayout
• Switch JourneyResultsPage over to ListItemLayout
• Replaced fontSize with textSize property introduced in UC 1.3 (fontSize used string comparison which was expensive)
• Migrated to PageHeaders which is a lot more customizable and a prerequisite for using AdaptivePageLayouts.

[krnekhelesh]

@mzanetti Please review and merge when you have time.

[mzanetti]

Sorry it took so long... But here goes the review:

Code looks fine. Thanks a lot for that!

Testing it I found 2 small issues. Both not introduced by this branch, but made visible through it:

• The about page doesn't fit any more on screen (testing on a Nexus 4). There's a Column in there with no height set (using the childrenRect.height). I guess the contents should be scaled accordingly to the available screen space.
• The 2 popups in the MainPage (backend selection and train types selection have color palette issues. There's a hack in the code which was required in the early days but now it actually breaks the colors. Please just delete those few lines and it should be ok.

[krnekhelesh]

Thanks for the review. Fixed the 2 issues that you listed.

[mzanetti]

thanks. lgtm now.

[smurfy]

Ok i will merge this changes soon.