Change: Add support for different horizontal graph scales.

Monthly data is stored for the current 24 months.
Quarterly data is stored for a further 2-6 years.
Yearly data is stored for a further 6-24 years.

src/tests/history_func.cpp

@@ -46,14 +46,13 @@ T GetHistory(const HistoryData<T> &history, uint period, uint age)
 TEST_CASE("History Rotation and Reporting tests")
 {
 	HistoryData<uint16_t> history{};
-	ValidHistoryMask valid_history = 0;
+	uint64_t valid_history = 0;
 
 	/* Fill the history with decreasing data points for 24 years of history. This ensures that no data period should
 	 * contain the same value as another period. */
 	uint16_t i = 12 * HISTORY_PERIODS;
 	for (uint date = 1; date <= 12 * HISTORY_PERIODS; ++date, --i) {
 		history[THIS_MONTH] = i;
-		UpdateValidHistory(valid_history, date % 12);
 		RotateHistory(history, valid_history, date % 12);
 	}