* refactor: deprecates ModuleSystem.render_template in favor of the added MakoSystem render_template method. Related changes: * Adds the MakoService to the StudioEditModuleRuntime, PreviewModuleSystem, LmsModuleSystem, and XBlockRuntime * MakoService constructor takes a `namespace_prefix` string, so that the CMS PreviewModuleSystem can render to LMS templates, without needing the special render_from_lms helper method. * ModuleSystem.render_template becomes a read-only property, so the constructor calls and test module systems are updated accordingly. * Adds tests for the MakoService and module system shims. (cherry picked from commit457f959356) * refactor: use MakoService.render_template to remove deprecation warnings from block code. (cherry picked from commit8d62d337f5) * refactor: use MakoService.render_template to remove deprecation warnings from test code. (cherry picked from commit26b43465a4) * test: Adds a test to verify the bug introduced by the previous changes The AuthoringMixin is automatically added to all XBlocks (see settings.XBLOCK_MIXINS), and AuthoringMixin.visibility_view expects the "mako" service. This test verifies the bug by testing the PureXBlock, which does not require the "mako" service, and so fails when the visibility_view is rendered. * fix: AuthoringMixin needs mako service which fixes the visibility_view for XBlocks which don't explicitly require the mako service. Also removes the unneeded class property _services_requested from AuthoringMixin and StudioEditableBlock. This property is better provided by the XBlockMixin class.
common ------ This directory contains common code shared between LMS and CMS, such as Mako templates, CSS, and Coffescript.