Courses and course formats

Hello,

I've updated the Grid format as follows:

• M3.8 V3.8.1.0 https://moodle.org/plugins/pluginversion.php?id=22859
• M3.9 V3.9.1.0 https://moodle.org/plugins/pluginversion.php?id=22858
• M3.10 V3.10.0.1 https://moodle.org/plugins/pluginversion.php?id=22857

With:

1. Fix 'Same color setting for "set or change img" as currentselectedimagecontainertextcolor in editing on' - #106.
2. Fix scroll bar in main region when editing in Boost.
3. Remove redundant 'defaultcoursedisplay' setting - #119.
4. Tidy up old strings.
5. Apply 'Add index to courseid format_grid_icon could improve performance' - #122, thanks to John (https://github.com/yao9394) for the patch.
6. Fix summary tooltip dismissing itself when floating over the section name.  If you find it is still an issue, then consider using the 'sectiontitlesummarymaxlength' setting.

Gareth