This commit adds a set of templates for the calendar month block, and
the events filter. The same data exporters used in the main calendar
view are utilised and the same logic.

Some additional data was added to the exporters, and in the long term
this will be used in the main monthly view so I did not feel it was
prudent to strip it out into a different view of the model.

AMOS BEGIN
 MOV [monthnext,access],[monthnext,calendar]
AMOS END

We want to avoid page jumps wherever possible. This change uses the original select element as a "proxy" to reserve the space
in the DOM for the enhanced auto-complete when the JS runs.

It uses visibility: hidden to make the select not rendered - but still take up space.

The exact sizing for the CSS was determined by testing and reverse engineering the bootstrap calculations.

The size of user pictures in selectors was reduced to avoid flicker when switching between no selection and a selected user. I
could have reserved a larger amount of space, but it looks worse for pickers with no pictures.

Instead of putting vertical-align: middle as indication for participants table
headers, none is set which leads to theme default, i.e. bottom in Clean and Boost.

This causes parts of the pagination bar to show through overlays and modals.

It's impossible to gain the right colour contrast against a dark footer
using the same primary colour that gets 4.5 against white.

* Remove custom styles for groups since we're using default Bootstrap
  styles now.
* Hidden input breaks grid layout. Moved it inside the groups column.
* Removed unnecessary 'groups' and 'members' classes. They are not being
  used in JS nor CSS.

--author="Urs Hunkler <urs.hunkler@unodo.de>"

Background position "left" can be flipped to "right" - no problem.
Background position "8px" cannot - because it's always measured from the top left.

The expected size of icons in the pix/b/ (big) folder was not respected
and they were displayed as 16x16 px.

The group / completion icons on the course page do not quite line up perfectly in boost or clean.

This tweaks them.

Adrian Greeve authored Mar 09, 2017 and Jake Dallimore committed Apr 19, 2017

Part of MDL-58138 epic

Adrian Greeve authored Mar 03, 2017 and Jake Dallimore committed Apr 19, 2017

Part of MDL-58138 epic

Ryan Wyllie authored Mar 21, 2017 and Dan Poltawski committed Apr 04, 2017

Part of MDL-55611 epic.

Ryan Wyllie authored Mar 24, 2017 and Dan Poltawski committed Apr 04, 2017

Part of MDL-55611 epic.

jun authored Mar 23, 2017 and Dan Poltawski committed Apr 04, 2017

Part of MDL-55611 epic.

Ryan Wyllie authored Mar 21, 2017 and Damyon Wiese committed Apr 03, 2017

Part of MDL-55611 epic.