tools(ace-mods): add @settime ACE mod for same-clock retail/acdream sky comparisons

Sky and weather gates need retail and acdream looking at the SAME Dereth
hour and the SAME authored day group; until now the only lever was
acdream's ACDREAM_WORLD_TIME/ACDREAM_DAY_GROUP pins, which retail cannot
follow, so the user could never judge night-sky differences (aurora,
dome edge) side by side.

@settime <hour|fraction> [Sunny|Rainy|Clear|Cloudy|<index>] jumps ACE's
Timers.PortalYearTicks FORWARD to the next matching instant. Every
TimeSync header carries that value, so both clients re-sync within
seconds. Forward-only because DelayActions compare against the same
clock (a backward jump would stall them). The calendar and day-group
roll duplicate acdream's retail ports (DerethCalendar shift 3600,
SkyDayGroupSelector LCG from SkyDesc::CalcPresentDayGroup @0x00500E10)
and the 20-entry name table was dumped from the installed Region DAT.

Install: copy SetTime.dll + Meta.json to C:\ACE\Mods\SetTime and run
@mod find (or restart ACE). Dev servers only.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

tools/ace-mods/SetTime/Meta.json

@@ -0,0 +1,10 @@
+{
+  "Name": "SetTime",
+  "Author": "acdream",
+  "Description": "@settime <hour|fraction> [Sunny|Rainy|Clear|Cloudy|<dayGroupIndex>] - jump the server's Dereth clock forward so every client (retail and acdream) sees the same hour and day group.",
+  "Version": "1.0",
+  "Priority": 0,
+  "Enabled": true,
+  "HotReload": true,
+  "RegisterCommands": true
+}