Add Timer

Timer initialized by Server with frequency of 60 Herts
Timer is not daemon
update UML for SimulationTimer
Properly package source files
reorganize packages
update timer static variable names
Add Timer Unit Test

May be more of an integration test, but best way to test it
Update subsystem UML
Merge pull request #18 from oharaandrew314/#11-simulation-timer

#11 simulation timer