Feature/time interpolation (#669)

* Initial implementation
* Better approximation of target time
* Correctly use double precision for time passing
* Cleanup
* Adding proportional adjustment of delta time at end of interpolation
* Keyframe based time interpolation
* Add property for time interpolation duration. Move time interpolation methods to TimeManager.
* Fix bugs with time gui
* Make several clicks on delta time buttons work as expected
* Clean up
* Improve time interpolation for parallel connection
* Improve time API. Fix time interpolation bugs.
* Fix mac compile issue
* Add hour button
* Add missing + sign
* Remove newer images from projection buffer when going back in time
* Add comment about clearing projection buffer
* Fix bug with jumping time in parallel connection
* Rename integrateFromTime to previousFrameTime
* Compile fix for iswa module
* Address code review comments
* Code cleanup
* Fix bug causig unsmooth behaviour when pausing while interpolating in time

modules/server/src/topics/setpropertytopic.cpp

@@ -29,6 +29,7 @@
 #include <openspace/properties/property.h>
 #include <openspace/query/query.h>
 #include <openspace/util/timemanager.h>
+#include <openspace/util/time.h>
 #include <ghoul/logging/logmanager.h>
 
 namespace {
@@ -46,7 +47,9 @@ void SetPropertyTopic::handleJson(const nlohmann::json& json) {
         std::string value = json.at(ValueKey).get<std::string>();
 
         if (propertyKey == SpecialKeyTime) {
-            OsEng.timeManager().time().setTime(std::move(value));
+            Time newTime;
+            newTime.setTime(value);
+            OsEng.timeManager().setTimeNextFrame(newTime);
         }
         else {
             properties::Property* prop = property(propertyKey);

modules/server/src/topics/timetopic.cpp

@@ -108,7 +108,7 @@ json TimeTopic::currentTime() {
 }
 
 json TimeTopic::deltaTime() {
-    json timeJson = { { "deltaTime", OsEng.timeManager().time().deltaTime() } };
+    json timeJson = { { "deltaTime", OsEng.timeManager().deltaTime() } };
     return wrappedPayload(timeJson);
 }