JSUtils

An attempt to add helper functions, depedencies, and modularity to frontend Drupal code.

Adds the following function (backend):

1. drupal_add_js_dependency(stack, name) - ensures a dependency is in effect before pages load to sidestep race conditions.

Adds the following function sets (frontend):

Dependency functions:

1. Drupal.modules.init_dependencies() - initialises all dependencies that were present in Drupal.settings on load.
2. Drupal.modules.init_dependency(stack, fallback = true) - create a dependency stack, optionally making it resolve after page load. May switch to a timeout in future.
3. Drupal.modules.add_dependency(stack, name) - adds a dependency to a dependency stack, which must be marked as resolved before the stack marks as resolved
4. Drupal.modules.resolve_dependencyname - resolves a named dependency on all stacks.
5. Drupal.modules.dependency_status(stack) - checks the status of a dependency stack
6. Drupal.modules.get_dependants(name) - lists stacks that depend on the named module.

Hook handling functions

1. Drupal.modules.attach(name, functions) - adds a module to the list of possible hook-implementors
2. Drupal.modules.implements(hook) - lists modules that implement the named hook
3. Drupal.modules.invoke(module, hook) - invokes a hook on a specific module
4. Drupal.modules.invoke_all(hook, [arg1, [arg2...]]) - invokes a hook on all modules that implement it.
5. Drupal.modules.alter(hook, data) - invokes a hook_alter on all modules that implement it.

Misc helper functions:

1. Drupal.url(path, options) - an "as close as can be" clone of the Drupal url() function.