fix doc error ("width" -> "height" in ysize description)
Merge pull request #297 from renpy/fix-doc

fix doc error ("width" -> "height" in ysize description)
Update changelog.
Fix typos.
Bump version.
Write function that determines if a python expression is constant.

This will be improved as incremental screen language work
continues, but this is a start.
Change single_track and shuffle exclusive
Ensure the projects directory is valid before using it.

See #304.
Ensure the projects directory is valid before using it.

See #304.
update japanese
update japanese
Merge pull request #305 from kyouryuukunn/update_japanese

Update Japanese translation
update japanese
update japanese
Document about show layer
Add documentation of show layer.

Merge remote-tracking branch 'kyouryuukunn/show_layer' into maintenance/6.17
Merge branch 'maintenance/6.17'
Make single_track and shuffle exclusive of each other.

Merge remote-tracking branch 'kyouryuukunn/musicroom' into maintenance/6.17
Documentation updates.
Safely list directories outside the Ren'Py base directory.

Directories in the projects directory might contain filenames
that aren't representable in the system encoding. We now
ignore these directories, rather than throwing an exception.