add renpy.set_mouse_pos()
add MouseMove and MouseJump action
fix doc
Bump version to 6.17.0.
Fix distribution script in case where we're at a tag.

When we're exactly at a base revision, the description relative to the
tag is missing some components.
Merge pull request #233 from kyouryuukunn/set_mouse_pos

Functions and actions to set the mouse position.
Do not block during mouse moves.
Simplify the actions so there's just MouseMove.
Default preferences.mouse_move to enabled.

If a creator decides to use MouseMove, it should work by default.
Adjust how default_afm_enable works.

Previously, it set afm_enable on every startup. Now when afm_enable
is not None, afm_enable is persisted.
Link variables and classes in the reserved names list.
scan_saved_game should use _save_name, not _extra_info.
Change list_saved_games as well.

Thanks, zorexx.