Two more new effects: upwave and canterwave.

include/effects.h

@@ -4,6 +4,8 @@
 #include "effects/clock.h"
 #include "effects/timer.h"
 
+#define SIMPLE_EFFECT [](accum88 t, uint16_t i, uint8_t x, uint8_t y)->int8_t
+
 struct EffectEntry {
 	const char* name;
 	bool use_in_cycle;