feat (wip): implementing camera zooming and panning functionality

vtk/src/commands/TimerCallbackCommand.cpp

@@ -2,6 +2,7 @@
 #include "../Program.h"
 
 
+// TODO: add getter/setters to attributes for customizability.
 TimerCallbackCommand::TimerCallbackCommand() : dt(3600), maxTime(3600*24*365), time(0) {}
 
 TimerCallbackCommand* TimerCallbackCommand::New(Program *program) {
@@ -22,7 +23,6 @@ void TimerCallbackCommand::Execute(vtkObject* caller, unsigned long eventId, voi
 }
 
 
-
 void TimerCallbackCommand::setProgram(Program *program) {
   this->program = program;
 }