Notification of string changes

Author: Safat
MDL-77576 communication_matrix: Create Matrix plugin
This commit will implement a matrix communication plugin
to integrate matrix services with core communication.

Originally implemented as MDL-76701, MDL-76702, MDL-77357,
MDL-76705, MDL-77473 and MDL-76708.

Co-Authored-By: Stevani Andolo <stevani.andolo@moodle.com>
Co-Authored-By: David Woloszyn <david.woloszyn@moodle.com>
Co-Authored-By: Safat Shahin <safat.shahin@moodle.com>


http://git.moodle.org/gw?p=moodle.git;a=commit;h=9a060a6d8d6e8f81971be6a0afab5feee506df1e
http://github.com/moodle/moodle/commit/9a060a6d8d6e8f81971be6a0afab5feee506df1e

+ 4.3 en [matrixuserid,communication_matrix]
+ 4.3 en [matrixuserid_desc,communication_matrix]
+ 4.3 en [matrixhomeserverurl,communication_matrix]
+ 4.3 en [matrixhomeserverurl_desc,communication_matrix]
+ 4.3 en [matrixaccesstoken,communication_matrix]
+ 4.3 en [matrixaccesstoken_desc,communication_matrix]
+ 4.3 en [matrixrefreshtoken,communication_matrix]
+ 4.3 en [matrixrefreshtoken_desc,communication_matrix]
+ 4.3 en [matrixelementurl,communication_matrix]
+ 4.3 en [matrixelementurl_desc,communication_matrix]
+ 4.3 en [pluginname,communication_matrix]
+ 4.3 en [privacy:metadata,communication_matrix]