Replace living statue and crystal soul graphics with versions that don't have a background

- Also included is details on how this was done, in case someone else can improve on it.
- Living statue attack graphic is derived from Exile III.

rsrc/remove-bg/apply-alpha.fx

@@ -0,0 +1,19 @@
+aval=u[1]*255;
+bval=u[2]*255;
+
+i==21&&j==8 ? debug(aval) : 1;
+i==21&&j==8 ? debug(bval) : 1;
+
+dist=bval-aval;
+
+i==21&&j==8 ? debug(dist) : 1;
+
+op=u[0].p{i,j}.a;
+
+i==21&&j==8 ? debug(op) : 1;
+
+mdist=op==0 ? 0 : dist/op;
+
+i==21&&j==8 ? debug(mdist) : 1;
+
+mdist/255