Remove the need to specify NUM_OF_ENCODERS for the Encoder feature (#6328)

* Remove the need to set NUM_OF_ENCODERS

Instead, calculate the size of the array, and use that instead

* Add hack for split common support

* Remove NUM_OF_ENCODERS from keyboard config

Can be reverted, if needed

keyboards/ropro/config.h

@@ -1,4 +1,4 @@
-#pragma once 
+#pragma once
 
 /* Copyright 2019 Garret G. (TheRoyalSweatshirt)
  *
@@ -13,10 +13,10 @@
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.#pragma once 
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.#pragma once
  */
 
-#include "config_common.h" 
+#include "config_common.h"
 
 /* USB Device descriptor parameter */
 #define VENDOR_ID       0xFEED
@@ -30,7 +30,6 @@
 #define MATRIX_ROWS 7
 #define MATRIX_COLS 14
 
-#define NUMBER_OF_ENCODERS 1
 #define ENCODERS_PAD_A { B7 }
 #define ENCODERS_PAD_B { D5 }