Updating AVR abstraction to be compatible with ARM, nearly ready for ARM files

- Very small updates to files, mostly modifying to remove name duplications

Scan/matrix/scan_loop.c

@@ -67,7 +67,7 @@ uint8_t scan_count = 0;
 
 // This is where the matrix scan data is held, as well as debouncing is evaluated to, which (depending on the read value) is handled
 //  by the macro module
-uint8_t KeyIndex_Array[KEYBOARD_SIZE + 1];
+uint8_t KeyIndex_Array[KEYBOARD_KEYS + 1];