Adds constants DECASB_ENTER and DECASB_EXIT to ansi.odin. ASB stands for Alternate Screen Buffer. DECASB_ENTER ( ?1049h ) saves the cursor position, clears the alternate buffer, and switches the view to said buffer. DECASB_EXIT ( ?1049l ) restores the main buffer's contents and the cursor position.
Commonly used by editors, games, and TUIs in general to avoid polluting the main buffer.