Add layout settings for side block on the front page

[Jeremy Hopkins]

The layout settings should allow administrators to choose how side blocks are displayed:

• disabled
• below marketing region / alongside course list (current)
• alongside marketing region and course list (would move up below slider)
• alongside slider, marketing region and course list (full height)

[Jeremy Hopkins]

Issue #312 was marked as a duplicate of this issue.

[Jeremy Hopkins]

Renderer for course blocks will need to remove js and put all into php.

Layout will need to adapt course blocks region where sidebar is "disabled" rendering main region full width and putting four blocks per row.

Other conditional code will need to choose where to render the side blocks.

Another complexity will be how this behaves when blocks are left aligned.

First step maybe to add only "enabled / disabled" to the admin options allowing course block area to show full width with four courses per row.

[Jeremy Hopkins]

Issue #351 was marked as a duplicate of this issue.