* develop:
[ticket/10652] Fixing typo in template class
[ticket/10645] Missing CSS for checkboxes
[ticket/10614] Change not installed heading to available.
[ticket/10614] Unbreak all_available on extension manager.
[ticket/10614] Check if cache exists before destroying it
[ticket/10614] Remove ext manager exceptions for now
[ticket/10614] Refactor list command to use manager API
[ticket/10614] Add purge command
[ticket/10614] Tweak list output, show state, purge cache, handle missing exts
[ticket/10614] Make script accessible from anywhere
[ticket/10614] Better usage output
[ticket/10614] Add a script to enable, disable and view status of extensions.
[ticket/10500] Use correct class name in @uses.
[ticket/10500] Fix phpbb_template_compile instantiation.