Byron/services selection

- cleaned up existing code
- implemented the "select services" layout & fragment
      > is dynamically populated with checkboxes corresponding to each service provided at the event
      > will eventually grab the information from the Salesforce DB, but for now grabs the info from a string array
- immediate todos: 
      > record input for the checkboxes
- further todos: 
      > start recording input for all forms into sharedPreferences 
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