hackamp: Update KiCad file versions and improve the PCB layout.

hackamp/hardware/bluetooth.kicad_sch

-(kicad_sch (version 20210406) (generator eeschema)
+(kicad_sch (version 20210621) (generator eeschema)
 
   (uuid a8c5ce0c-fef5-484a-aa16-51e02bba952e)
 
           (number "11" (effects (font (size 1.27 1.27))))
         )
         (pin input line (at 20.32 30.48 180) (length 2.54)
-          (name "~RST" (effects (font (size 1.27 1.27))))
+          (name "~{RST}" (effects (font (size 1.27 1.27))))
           (number "12" (effects (font (size 1.27 1.27))))
         )
         (pin power_in line (at -20.32 27.94 0) (length 2.54)
           (number "6" (effects (font (size 1.27 1.27))))
         )
         (pin input line (at -20.32 -33.02 0) (length 2.54)
-          (name "SPI/~PCM" (effects (font (size 1.27 1.27))))
+          (name "SPI/~{PCM}" (effects (font (size 1.27 1.27))))
           (number "7" (effects (font (size 1.27 1.27))))
         )
         (pin bidirectional line (at -20.32 12.7 0) (length 2.54)
           (number "21" (effects (font (size 1.27 1.27))))
         )
         (pin input line (at 12.7 10.16 180) (length 2.54)
-          (name "~OE" (effects (font (size 1.27 1.27))))
+          (name "~{OE}" (effects (font (size 1.27 1.27))))
           (number "22" (effects (font (size 1.27 1.27))))
         )
         (pin power_in line (at 2.54 15.24 270) (length 2.54)
     (effects (font (size 1.27 1.27)) (justify right bottom))
     (uuid 254ee71e-606d-4d42-b1b8-4e8045f531ab)
   )
-  (label "SPI{slash}~PCM_1V8" (at 172.72 49.53 180)
+  (label "SPI{slash}~{PCM_1V8}" (at 172.72 49.53 180)
     (effects (font (size 1.27 1.27)) (justify right bottom))
     (uuid 814e54bb-0d24-4113-b136-1406348e54a0)
   )
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid a91b884b-359e-427d-b60a-9fded2e7a923)
   )
-  (label "SPI{slash}~PCM_1V8" (at 203.2 92.71 0)
+  (label "SPI{slash}~{PCM_1V8}" (at 203.2 92.71 0)
     (effects (font (size 1.27 1.27)) (justify left bottom))
     (uuid 70cca06d-2f7d-43ce-8a5e-ba36f6211efd)
   )
     (effects (font (size 1.27 1.27)) (justify right))
     (uuid 84a7da3a-656e-4bff-917a-d373c9094c00)
   )
-  (hierarchical_label "SPI{slash}~PCM" (shape input) (at 27.94 49.53 180)
+  (hierarchical_label "SPI{slash}~{PCM}" (shape input) (at 27.94 49.53 180)
     (effects (font (size 1.27 1.27)) (justify right))
     (uuid 84ccd6b7-cc37-4b9c-bc6b-7817b577b6c9)
   )

hackamp/hardware/front.kicad_sch

-(kicad_sch (version 20210406) (generator eeschema)
+(kicad_sch (version 20210621) (generator eeschema)
 
   (uuid 1b3ee182-5b05-4bd3-b0f6-a5491adf7f08)
 
     (effects (font (size 1.27 1.27)) (justify right))
     (uuid 6b166bc2-8f0d-4e7d-93c4-3cf7c85424f6)
   )
-  (hierarchical_label "FRONT_~RST" (shape input) (at 45.72 110.49 180)
+  (hierarchical_label "FRONT_~{RST}" (shape input) (at 45.72 110.49 180)
     (effects (font (size 1.27 1.27)) (justify right))
     (uuid 188d68b4-f3e2-463e-b31a-919aec0b8b54)
   )