MDL-42573 skydrive: support non-js login scheme

This is actually not especially useful because Microsoft don't currently
support non-JS login. But its possible they could make it work in
future. And at least the user gets an error from MS rather than blank
screen.
MDL-42598 quiz variant randomisation not random enough.

A student would get the same question variants (for example for a
calculated question) on their first attempt at both copies of a
duplicated quiz.
MDL-33536 navigation: hide hidden categories from the navbar
MDL-42215 lang: improved the help string for fullnamedisplay
MDL-42683 EditPDF: stamp picker button size is wrong
MDL-40481 quiz responses report needs cols need text_sorting
MDL-42728 Merge English strings from the en_fix language pack
MDL-42666 repository_boxnet: Convert repository to APIv2
MDL-42666 repository_boxnet: Function to convert APIv1 references to true copies
MDL-42666 repository_boxnet: Tool to launch the migration
MDL-42666 repository_boxnet: Advise the user to run the migration tool
MDL-42666 repository_boxnet: Disabling file references
MDL-42666 repository_boxnet: Remove hardcoded date for APIv1 end of life
MDL-42666 oauthlib: Getter methods for accesstoken, client id and secret
MDL-42666 repository_boxnet: Revoke access token when logging out
MDL-42672 blocks: warnings on /mod/xxx/index.php for frontpage course
MDL-42697 Theme: Fix overflow on docked blocks
MDL-42692 Quiz: Fixed z-index for tab and marks

On edit quiz page marks/reorder text box has zindex set, which should be considered by modal
window. Also, tab set is also using zindex for active node.
MDL-41586 libraries: Fix scale issues

The default value of scale should be null not false in mssql, that is the
standard with other DBs
0 is a valid value for scale, don't change it in oracle
MDL-42375 course: management interface icon spacing improved

Fixed the display of icons and their spacing when JS is disabled.