Removed remaining references to TimerTask

Getting intermittent issues with talking to a dead thread - unable to
directly trace it, but all instances were in code tied to the old
TimerTask code.  So, as TimerTask is no longer required, removed all
references to TimerTask
Renamed DataRefreshService

to LocationRefreshService

Keeping it as DataRefreshService could cause confusion with the
DataRefreshTask - the service actually uses LocationRefreshTask