Upgrade Gridstack to Gridstack 4.X

Patch for "master" branch: https://reviews.mahara.org/11815

Patch for "master" branch: https://reviews.mahara.org/11900

Patch for "main" branch: https://reviews.mahara.org/12111

Patch for "main" branch: https://reviews.mahara.org/12112

Hi Bob,
The dotted lines that indicate the placement of the blocks in gridstack are wayyy too faint for my eyes (and therefore, probably others too), really hard to see. Could we pretty please darken them?

htdocs/theme/raw/sass/layout/_gridlayout.scss : line 53
htdocs/theme/raw/sass/lib/_gridstack.scss : line 35

ps here's the bug I reported, confirmed by Kristina:
https://bugs.launchpad.net/mahara/+bug/1952141

Cheers!

Reviewed: https://reviews.mahara.org/12111
Committed: https://git.mahara.org/mahara/mahara/commit/4c9cec56c0ed46523a6b01e403bb69ff131841fd
Submitter: Robert Lyon (<email address hidden>)
Branch: main

commit 4c9cec56c0ed46523a6b01e403bb69ff131841fd
Author: Lisa Seeto <email address hidden>
Date: Wed Jun 2 15:36:56 2021 +1200

Bug 1928273: Upgrade Gridstack to Gridstack 4.3.X

When calling grids we now assign the grid and grid element objects thus:

var grid = a gridstack object
var gridElement = a jquery .grid-stack selector object

Need to explicitly indicate the $() as jQuery() in filebrowser.js to
get things to work as expected for file upload in block config

Change-Id: I78a096f23397af42554a04f75d1bfceec1716173
Signed-off-by: Lisa Seeto <email address hidden>

Patch for "main" branch: https://reviews.mahara.org/c/mahara/+/12611

Reviewed: https://reviews.mahara.org/c/mahara/+/12611
Committed: https://git.mahara.org/mahara/mahara/commit/ebfa4aa6349f85c7afc6fa6280d0abe5a37637e2
Submitter: "Gold <email address hidden>"
Branch: main

commit ebfa4aa6349f85c7afc6fa6280d0abe5a37637e2
Author: Robert Lyon <email address hidden>
Date: Tue Apr 19 14:12:51 2022 +1200

Bug 1928273: make drag border correct colour

Change-Id: Ib6943b8abf947dba378dfae2c2576eb3b59bf367
Signed-off-by: Robert Lyon <email address hidden>

Patch for "22.04_DEV" branch: https://reviews.mahara.org/c/mahara/+/12644

Reviewed: https://reviews.mahara.org/c/mahara/+/12644
Committed: https://git.mahara.org/mahara/mahara/commit/8a38fa8fa040321ceb5b5100ce71c46285faf44b
Submitter: "Robert Lyon <email address hidden>"
Branch: 22.04_DEV

commit 8a38fa8fa040321ceb5b5100ce71c46285faf44b
Author: Robert Lyon <email address hidden>
Date: Tue Apr 19 14:12:51 2022 +1200

Bug 1928273: make drag border correct colour

Change-Id: Ib6943b8abf947dba378dfae2c2576eb3b59bf367
Signed-off-by: Robert Lyon <email address hidden>
(cherry picked from commit ebfa4aa6349f85c7afc6fa6280d0abe5a37637e2)