Switch timestamp fields from 32 to 64 bit

This is a wire-compatible change.
The maximum duration that can be stored in a signed 32bit integer in microsecond precision is about 70 minutes.
If the target language has no support for signed integers, it is only 35 minutes.
With that, the stage time can easily run into an overflow.

Author: g3force

internal/app/publish/messagegenerator.go

@@ -145,15 +145,15 @@ func newRefereeMessage() (m *state.Referee) {
 	m.SourceIdentifier = new(string)
 	m.PacketTimestamp = new(uint64)
 	m.Stage = new(state.Referee_Stage)
-	m.StageTimeLeft = new(int32)
+	m.StageTimeLeft = new(int64)
 	m.Command = new(state.Referee_Command)
 	m.CommandCounter = new(uint32)
 	m.CommandTimestamp = new(uint64)
 	m.Yellow = newTeamInfo()
 	m.Blue = newTeamInfo()
 	m.BlueTeamOnPositiveHalf = new(bool)
 	m.NextCommand = new(state.Referee_Command)
-	m.CurrentActionTimeRemaining = new(int32)
+	m.CurrentActionTimeRemaining = new(int64)
 	return
 }
 
@@ -189,6 +189,6 @@ func unsigned(v int) uint32 {
 	return uint32(v)
 }
 
-func microseconds(dur *durationpb.Duration) int32 {
-	return int32(dur.Seconds)*1_000_000 + dur.Nanos/1000
+func microseconds(dur *durationpb.Duration) int64 {
+	return int64(dur.Seconds)*1_000_000 + int64(dur.Nanos/1000)
 }

internal/app/state/ssl_gc_referee_message.pb.go

@@ -71,7 +71,7 @@ message Referee {
     //
     // If the stage runs over its specified time, this value
     // becomes negative.
-    optional sint32 stage_time_left = 3;
+    optional sint64 stage_time_left = 3;
 
     // These are the "fine" states of play on the field.
     enum Command {
@@ -205,7 +205,7 @@ message Referee {
     //  * free kicks
     //  * kickoff, penalty kick, force start
     //  * ball placement
-    optional int32 current_action_time_remaining = 15;
+    optional int64 current_action_time_remaining = 15;
 }
 
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