add 48boxes.arrow effect

res/FX.CONF

@@ -112,6 +112,7 @@ INTERLOCK.UD
 LITTLE.BOXES
 SPIRAL
 WAVY.CORNER
+BOXES48.ARROW
 REDLINES
 FLICK
 [eof]

src/fx/fx.hgr.48boxes.arrow.a

@@ -0,0 +1,36 @@
+;license:MIT
+;(c) 2020 by 4am & qkumba
+;
+!cpu 6502
+!to "build/FX/BOXES48.ARROW",plain
+*=$6000
+
+USES_CLEAR = 0
+
+         !source "src/fx/fx.hgr.48boxes.common.a"
+
+         !byte $FA,$F6,$F4,$F0,$EE,$EA,$E8,$E4
+         !byte $FC,$FA,$F6,$F4,$F0,$EE,$EA,$E8
+         !byte $00,$FC,$FA,$F6,$F4,$F0,$EE,$EA
+         !byte $FF,$FD,$F9,$F7,$F3,$F1,$ED,$EB
+         !byte $FD,$F9,$F7,$F3,$F1,$ED,$EB,$E7
+         !byte $F9,$F7,$F3,$F1,$ED,$EB,$E7,$E5
+
+StagesHi ; high bytes of address of drawing routine for each stage
+         !byte copy00
+         !byte copy01
+         !byte copy02
+         !byte copy03
+         !byte copy04
+         !byte copy05
+         !byte copy06
+         !byte copy07
+         !byte copy08
+         !byte copy09
+         !byte copy0A
+         !byte copy0B
+         !byte copy0C
+         !byte copy0D
+         !byte copy0E
+         !byte copy0F
+EndStagesHi