[5.4] Add getSection to view factory

[VinceG]

We currently have getSections and hasSection, it just makes sense to also have getSection. In practice this comes handy since right now we have to do something like this in views:

@if(count(View::getSections()['actions']))

or

@foreach(View::getSections()['actions'] as $i => $item)

This is a small addition that can make it a little bit cleaner and easier to understand.

The above will be translated to

@foreach(View::getSection('actions') as $i => $item)

the second parameter $default allows to handle those cases when that section does not exist at all and use a default.

Thank You.