Start beautifying the code

* Split out SPI and display (a little)
* Use more of the common Macros
* Remove wasted bytes from notomono font
* Create a mock "menu"

macros.h

@@ -43,12 +43,12 @@
         (x) |= 1u << (y);                       \
     } while (0)
 
-#define CLEAR(x, y)                             \
+#define CLR(x, y)                             \
     do {                                        \
         (x) &= ~(y);                            \
     } while (0)
 
-#define CLEAR_POS(x, y)                         \
+#define CLR_POS(x, y)                         \
     do {                                        \
         (x) &= ~(1u << (y));                    \
     } while (0)
@@ -67,7 +67,7 @@
     static_assert((clear_mask & val) == val,                            \
                   "'value' in SET_TO() has bits set that are not in clear_mask"); \
     do {                                                                \
-        CLEAR(x, clear_mask);                                           \
+        CLR(x, clear_mask);                                           \
         SET(x, val);                                                    \
     } while (0)