Merge branch...

Merge branch '100-make-slopes-static-by-default-and-require-flag-to-turn-them-dynamic' into 'master'

Resolve "Make slopes static by default, and require flag to turn them dynamic."

Closes #100

See merge request STJr/SRB2Internal!140

src/p_slopes.c

@@ -251,7 +251,7 @@ void P_SpawnSlope_Line(int linenum)
 	UINT8 flags = 0; // Slope flags
 	if (line->flags & ML_NOSONIC)
 		flags |= SL_NOPHYSICS;
-	if (line->flags & ML_NOTAILS)
+	if (!(line->flags & ML_NOTAILS))
 		flags |= SL_NODYNAMIC;
 	if (line->flags & ML_NOKNUX)
 		flags |= SL_ANCHORVERTEX;