Update schematic files to Kicad 6.

Had to fix some symbols which didn't have perfect matches in K6.

Author: thejpster

.gitignore

@@ -5,14 +5,10 @@
 *.000
 *.bak
 *.bck
-*.pro-bak
-*.kicad_pcb-bak
-*.sch-bak
+*.*-bak
 *~
 _autosave-*
 *.tmp
-*-save.pro
-*-save.kicad_pcb
 fp-info-cache
 Kicad/Neotron-Common-Hardware-backups
 Kicad/*-cache.*

Kicad/Neotron-Common-Hardware.kicad_pro

@@ -485,5 +485,8 @@
       "Real Time Clock"
     ]
   ],
-  "text_variables": {}
-}
+  "text_variables": {
+    "date": "2022-12-24",
+    "version": "5e6e2d6"
+  }
+}