Boston meetup 2019 (#5611)

* Add boston_meetup folder for community meetup macropads

* Modify OLED indicators to match macropad

* PR cleanup

* Spelling fix

Co-Authored-By: ishtob <ishtob@gmail.com>

* convert custom matrix to standard matrix defines

* refactor layer define with enum

* Remove un-used files

* remove "\" in keymap

keyboards/boston_meetup/2019/info.json

@@ -0,0 +1,12 @@
+{
+  "keyboard_name": "Boston Meetup 2019", 
+  "url": "", 
+  "maintainer": "qmk", 
+  "width": 4, 
+  "height": 4, 
+  "layouts": {
+    "LAYOUT": {
+      "key_count": 13,
+ "layout": [{"label":"K00", "x":0, "y":0}, {"label":"K10", "x":0, "y":1}, {"label":"K11", "x":1, "y":1}, {"label":"K12", "x":2, "y":1}, {"label":"K13", "x":3, "y":1}, {"label":"K20", "x":0, "y":2}, {"label":"K21", "x":1, "y":2}, {"label":"K22", "x":2, "y":2}, {"label":"K23", "x":3, "y":2}, {"label":"K30", "x":0, "y":3}, {"label":"K31", "x":1, "y":3}, {"label":"K32", "x":2, "y":3}, {"label":"K33", "x":3, "y":3}]    }
+  }
+}