[Keyboard] FLX Virgo, cleaned up layouts and added VIA keymap (#7997)

* Reworked for VIA support

Reworked for VIA support and tidying up of older code.

* Fixed naming issues, and prepared for VIA compat

Via compat added

* Improve layouts, tidy code, via keymap

Added support for VIA and cleaned up some code and layouts.

* Implimented suggestions by MechMerlin

* Fix capitalisation 

Mistake raised by Drashna now fixed.

* Tidy comments as requested by noroadsleft

* Tidy comments as requested by fauxpark

keyboards/flx/virgo/info.json

@@ -1,12 +1,11 @@
 {
-    "keyboard_name": "flx-virgo-default",
+    "keyboard_name": "FLX Virgo",
     "url": "",
     "maintainer": "qmk",
     "width": 20.25,
     "height": 6.25,
     "layouts": {
         "LAYOUT": {
-            "key_count": 91,
             "layout": [
                 {"label":"K00 (C6,F0)", "x":0, "y":0},
                 {"label":"K01 (C6,F1)", "x":1.5, "y":0},