MDL-45758 tool_monitor: Implement a class to generate list of events

Original issue - MDL-46109
MDL-45758 tool_monitor: Implement a rule instance class

Original issue - MDL-45939
MDL-45758 navigation: updates to navigation

This patch does the following:-
Start using proper key for course report node
Allow admin tools to hook into course navigation

Original issue - MDL-46131
MDL-45758 tool_monitor: Build the navigation tree for the tool

Original issue - MDL-46131
MDL-45758 tool_monitor: Add a subscription manager class

Original issue - MDL-45919
MDL-45758 tool_monitor: Rule manager class and data generators

This issue introduces rule manager class, data generators and unit tests
associated with them.

Original issue - MDL-45918
MDL-45758 tool_monitor: Polish the code for rule manager and unit tests

Original issue - MDL-45918
MDL-45758 tool_monitor: Initial version of rule form.

Original issue - MDL-45938
MDL-45758 tool_monitor: YUI module to handle event selection dropdown

Original issue - MDL-45938
MDL-45758 tool_monitor: Add support for editing/creating a rule

Original issue - MDL-45938
MDL-45758 tool_monitor: Create rendering code for manage rules page

Original issue - MDL-46110
MDL-45758 tool_monitor: Display a rule managment interface

Original issue - MDL-46110
MDL-45758 tool_monitor: Handle rule managment

Original issue - MDL-46130
MDL-45758 tool_monitor: Create a subscription instance class

Original issue - MDL-46241
MDL-45758 tool_monitor: Add a renderer for the subscription page

Original issue - MDL-46111
MDL-45758 tool_monitor: Add renderables for the subscription page

Original issue - MDL-46111
MDL-45758 tool_monitor: Update subscription manager class

Update the class to support the subs renderable

Original issue - MDL-461111
MDL-45758 tool_monitor: Add a UI page to manage subscriptions

Original issue - MDL-46111
MDL-45758 tool_monitor: Add a course delete observer

Original issue - MDL-46510
MDL-45758 tool_monitor: Add unit tests for the course deleted observer

Original issue - MDL-46510