This introduces a new "controlled link" file type where the file is not
stored in Moodle - but Moodle will control the access permissions on the file.
Plugins can "freeze" a filearea which means Moodle will take ownership of all the remote
files of this type.
When accessing a file, if the "filebrowser" infomation indicates the current user can write to the file, they
will be granted temporary write access.
Part of MDL-58220
This change moves all operations which deal with the fetching/updating, or
setting of files from the file_storage class into a new file_system class.
A new file_system can be specified in the config.php and used to replace
all relevant methods in order to move the file system component to an
alternative solution.
Changes include:
* question: Add bootstrap classes to buttons and selects so they look consistent.
* mod_quiz: Add bootstrap styles to report form elements
* question: Add bootstrap classes to question form elements
* And remove the success/fail styles from boost because they conflict badly
with the quiz plugin styles (making unreadable text).
* quiz: nav block buttons had black background
* quiz: Add bootstrap styles to quiz navigation buttons
* qtype_ddmarker: Remove bullets from list
Edit form coordinates preview had list bullets for each coordinate.
* boost: Prevent menu scrolling on quiz edit
* mod_quiz: Add bootstrap styles to edit quiz fields
Pagination and max grades forms.
* quiz: Undo some custom styles on review options
These checkboxes were laid out in a fake grid with no responsiveness
that conflicts with the bootstrap form-inline templates. Reset the
custom style to bootstrap default.
* quiz: Fix unit tests for boost changes
* qtype_ddwtos: Accurate positioning of drop targets
* questions: Make the review page responsive
* question: bootstrap 4 compatibility
.alert in bs4 contains no colours by default, you need to mix it with
one of the context classes to get some change in colours, borders etc.
This patch does not actually change the value of strings. It only fixes
the coding style issues raised by the prechecker (missing spaces around
the assignment operator).
Added an upgrade step to remove duplicate stamps, added a unique index
on (contextid, stamp) and modified the question_category edit code such
that stamp duplication in the same context is not permitted.
