0.17-beta release notes

in-game audio settings
hidden border join nodes do not auto-delete where strong meets normal, previously this allowed unpredictable border strength in custom levels
fixed the bug where you see a wee black dot on a selected closed loop
better level name validation in the editor
fixed NullPointerException during "save map as", when the map was empty
changed window decorations checkbox to "with borders" / "borderless" combo
constructor borders only snip back for up to the last 20 vertices, beyond that point they block themselves