Change the display name of the my overview block to Course overview to
match the block it is replacing (and the UX prototype).

The use of "My" is no longer recommended when naming things in Moodle.

jun authored Mar 30, 2017 and Dan Poltawski committed Apr 04, 2017

Part of MDL-55611 epic.

Mark Nelson authored Dec 20, 2016 and Damyon Wiese committed Apr 03, 2017

Part of MDL-55611 epic.

block_base->config_save is not used anywhere any more. If contributed plugins
rely on it, it makes no difference since it is not being called, if they do
something like $this->config_save or parent::config_save somewhere in their
block class instance, this will still work as deprecated function will handle
it.

This patch includes:

* version column removed from modules table, now using standard config, this allows decimal version for modules
* version column removed from block table, now using standard config, this allows decimal version for blocks
* module version.php can safely use $plugins instead of module
* new plugin_manager bulk caching, this should help with MUC performance when logged in as admin
* all missing plugins are now in plugin overview (previously only blocks and modules)
* simplified code and improved coding style
* reworked plugin_manager unit tests - now using real plugins instead of mocks
* unit tests now fail if any plugin does not contain proper version.php file
* allow uninstall of deleted filters

block_xxx_pluginfile() now accepts the $options parameter that is to be passed
to the send_stored_file() function.

MDL-23234 finally standardised use of settings.php across all plugins - the only partial exceptions now are report and local plugins

MDL-20204 first batch of major theme changes, some regressions are still there, expect more changes and improvements soon; see tracker for details and list of subtasks

MDL-20700 coding style cleanup - cvs keywords removed, closign php tag removed, trailing whitespace cleanup

MDL-17458 upgrade logging implemented + a lot more refactoring + exceptions implemented in install/upgrade code + lang pack cleanup + some more improvements

MDL-17457 migrated all modules to new db/install.php; added upgrade.txt file for devs converting contrib modules