Fixed date and time consistency across Campaigns and Missions

This fixes campaign mission generation mostly, but a full playthrough
will be needed. Missions now serialize and accept stardate setting a
bit better. Thanks to this, date is propagated over multiplayer, too.

This seems to break points system?

Code-wise, this does not workaround the problems from before namely
over-reliance on side-effects. Stardate class is at least one small
step into good direction. Now, it'd be nice to attach clocks to
simulation and campaign and whatever else that needs them.

1 files changed, 3 insertions, 2 deletions

diff --git a/StarsEx/Clock.cpp b/StarsEx/Clock.cpp
index 60e6f67..252cc69 100644
--- a/StarsEx/Clock.cpp
+++ b/StarsEx/Clock.cpp
@@ -80,9 +80,10 @@ Clock::Step()
 
 
 void
-Clock::ResetGameTime()
+Clock::ResetGameTime(double seconds)
 {
-    m_game_elapsed = inner_clock::duration::zero();
+    const std::chrono::duration<double> target {seconds};
+    m_game_elapsed = std::chrono::duration_cast<inner_clock::duration>(target);
 }