Add departure boards and timetable tick status to SLXI info.

Implementing converting timetable start date to/from ticks/days in
afterload code.

src/saveload/afterload.cpp

@@ -2968,6 +2968,23 @@ bool AfterLoadGame()
 #endif
 	}
 
+	if (SlXvIsFeaturePresent(XSLFI_TIMETABLES_START_TICKS) && WALLCLOCK_NETWORK_COMPATIBLE) {
+		// savegame timetable start is in ticks, but we want it in days, fix it up
+		Vehicle *v;
+		FOR_ALL_VEHICLES(v) {
+			if (v->timetable_start != 0) {
+				v->timetable_start /= DAY_TICKS;
+			}
+		}
+	} else if (SlXvIsFeatureMissing(XSLFI_TIMETABLES_START_TICKS) && (!WALLCLOCK_NETWORK_COMPATIBLE)) {
+		// savegame timetable start is in days, but we want it in ticks, fix it up
+		Vehicle *v;
+		FOR_ALL_VEHICLES(v) {
+			if (v->timetable_start != 0) {
+				v->timetable_start *= DAY_TICKS;
+			}
+		}
+	}
 
 	/* Station acceptance is some kind of cache */
 	if (IsSavegameVersionBefore(127)) {

src/saveload/extended_ver_sl.cpp

@@ -32,6 +32,7 @@
 #include "../debug.h"
 #include "saveload.h"
 #include "extended_ver_sl.h"
+#include "../timetable.h"
 
 #include <vector>
 
@@ -45,6 +46,8 @@ std::vector<uint32> _sl_xv_discardable_chunk_ids;           ///< list of chunks
 static const uint32 _sl_xv_slxi_chunk_version = 0;          ///< current version os SLXI chunk
 
 const SlxiSubChunkInfo _sl_xv_sub_chunk_infos[] = {
+	{ XSLFI_DEPARTURE_BOARDS, XSCF_IGNORABLE_UNKNOWN, 1, 1, "departure_boards", NULL, NULL, NULL },
+	{ XSLFI_TIMETABLES_START_TICKS, XSCF_NULL, WALLCLOCK_NETWORK_COMPATIBLE ? 0 : 1, 1, "timetable_start_ticks", NULL, NULL, NULL },
 	{ XSLFI_NULL, XSCF_NULL, 0, 0, NULL, NULL, NULL, NULL },// This is the end marker
 };
 

src/saveload/extended_ver_sl.h

@@ -21,6 +21,8 @@
  */
 enum SlXvFeatureIndex {
 	XSLFI_NULL                          = 0,      ///< Unused value, to indicate that no extended feature test is in use
+	XSLFI_DEPARTURE_BOARDS,                       ///< Departure boards patch, in ticks mode
+	XSLFI_TIMETABLES_START_TICKS,                 ///< Timetable start time is in ticks, instead of days (from departure boards patch)
 
 	XSLFI_SIZE,                                   ///< Total count of features, including null feature
 };