Scenario Capture the Flag updates

[Xansta]

• Switch from using varieties to using settings.
• Switch to place station and generate call sign scenario utilities.
• Divide global variables and constants into their own initialization functions.
• Switch to using getScenarioTime() for timed actions.
• Simplify player ship setup routines.
• Fix some flag status message displays.
• Refactor enemy ship spawning.
• Simplify update loop by removing substitutionary function logic where applicable.