Stonewall generation changed to pre-open wall if necessary.

GT Mini bosses no longer drop heart containers.
Crystal switch logic during generation updated.

asm/overrides.asm

@@ -20,4 +20,21 @@ LampCheckOverride:
 		LDA LampConeDarkWorld
 	.done
 	;BNE + : STZ $1D : + ; remember to turn cone off after a torch
-RTL
+RTL
+
+GtBossHeartCheckOverride:
+    lda $a0 : cmp #$1c : beq ++
+    cmp #$6c : beq ++
+    cmp #$4d : bne +
+    ++ lda DRFlags : and #$01 : bne ++ ;skip if flag on
+        lda $403 : ora #$80 : sta $403
+    ++ clc
+rtl
+    + sec
+rtl
+
+OnFileLoadOverride:
+    jsl OnFileLoad ; what I wrote over
+    lda DRFlags : and #$80 : beq +  ;flag is off
+        lda $7ef086 : ora #$80 : sta $7ef086
++ rtl