til_stream: introduce "pre" module contexts on stream

This adds an api for maintaining a list of pre-render module
contexts on-stream which will be rendered via til_stream_render()
before rendering hte main module context on the stream that's
been set via til_stream_set_module_context().

til_stream_add_pre_module_context()
til_stream_del_pre_module_context()

are the new functions, no references are taken for now (but
comments note the possibility of adding that)

This is just a preparatory commit, no real functional difference.

0 files changed, 0 insertions, 0 deletions