* Introduce the "actionmenulinkclasses" block in the action_menu_link
template so other templates importing it can have the option to override
its classes.
* Have the action menu trigger template use the action menu link
template to reduce code duplication.
With the static function variable $instance, calls to
\action_menu_link::export_for_template() from its subclasses are stored
in different variables. This causes duplicate IDs when different
implementations of action menu links are rendered on the action menu
trigger/link template. (e.g. action_menu_link and
action_menu_link_secondary both rendered on the same page).
To make the incrementing uniform for the action_menu_link class and its
implementations, the $instance variable is moved out of the
export_to_template() method and is now made to a static class variable.
If a scheduled task which uses a 'R' field is picked, then the reset of
updated task times will not necessarily be correctly determined as the
randomisation is picked during reset.
This can lead to some random test failures.
Actively specifying a test which does not make use of the 'R' random
field time addresses this issue.
Under parallel development, when something is worth being commented
in upgrade.txt notes, it will be applied to all the development branches
using the "earliest" one to be released. So, if something changes
in 3.10 (and also is applied to master), the upgrade.txt notes will
show 3.10 in both branches.
Of course, if something only goes to one dev branch (say master), then the
master version will be used in the notes (4.0 in this case).
Currently, PHP getimagesize method doesn't support SVG images.
As some features, such as badges, processs and optimise the images
before using them, a new filetype group has been created to exclude
SVG from there: optimised_image.
SVG can't be removed from web_image because then users won't be
able to add SVG images to their courses using labels, pages...
- Also bump travis to get builds against 310_STABLE.
- And backup release to match 3.10
Note this doesn't aim to be a complete change-set, but just the
minimum to switch to 3-digit $branches and keep installation, checks
and tests running and passing.