add patchers/a5count for Houghton Mifflin disks, fix potential infinite loop in patchers/border

src/passport.a

@@ -701,6 +701,7 @@ _applyToAll
          !source "patchers/universale7.a"
          !source "patchers/runhello.a"
          !source "patchers/a6bc95.a"
+         !source "patchers/a5count.a"
          !source "patchers/d5d5f7.a"
          !source "patchers/prodosrwts.a"
          !source "patchers/prodosmecc.a"

src/patchers/a5count.a

@@ -0,0 +1,28 @@
+;-------------------------------
+; #A5COUNT
+; nibble count between $A5 and
+; address prologue
+; e.g. Game Frame One, Game Frame Two
+;-------------------------------
+_a5count
+         lda   gIsPascal  ; only ever seen this protection
+         bne   a5count_exit      ; on Pascal disks
+
+         ldy   #$0A
+         jsr   SearchTrack
+         !byte $07,$E6,$02,$D0,$03,$4C,$A5,$00
+         !byte $C9,$A5
+         bcs   a5count_exit
+         sta   gDisplayBytes
+         pha
+         lda   #s_a5count
+         jsr   PrintByID
+         txa
+         clc
+         adc   #$08
+         tax
+         pla
+         ldy   #$02
+         jsr   modify
+         !byte $D0,$7B
+a5count_exit

src/patchers/border.a

@@ -8,9 +8,9 @@
 ;-------------------------------
 _border
          lda   gIsBoot0   ; if DOS 3.3 boot0 loader
-         bne   rwtsswap_exit
+         bne   border_exit
          lda   gIsBoot1   ; and DOS 3.3 boot1 loader
-         bne   rwtsswap_exit
+         bne   border_exit
          lda   #$08
          ldx   #$5A
          ldy   #$0A

src/strings/en.a

@@ -82,7 +82,8 @@ s_encoded44 =  $3F
 s_encoded53 =  $40
 s_specdel =    $41
 s_bytrack =    $42
-STRINGCOUNT =  $43
+s_a5count =    $43
+STRINGCOUNT =  $44
 
 StringTable
          !word header
@@ -152,6 +153,7 @@ StringTable
          !word encoded53
          !word specdel
          !word bytrack
+         !word a5count
 ;
 ; Text can contain substitution strings, which
 ; are replaced by current values at runtime. Each
@@ -396,3 +398,5 @@ specdel
          !text "T00,S00 Found DOS 3.3P bootloader",$8D,00
 bytrack
          !text "T%t,S%0 RWTS changes based on track",$8D,$00
+a5count
+         !text "T%t,S%0 Found A5 nibble count",$8D,$00