Also nuke external library with same events.

Also nuke external library with the same event.
Add compatibility for event `onRealDifficultyChanged`, referencing `onDifficultyChanged`.

### Functions
- modApi.deployment.isDeploymentPhase
- modApi.deployment.isLandingPhase
- modApi.deployment.getSelected
- modApi.deployment.getDeployed
- modApi.deployment.getRemaining

### Events
- modApi.events.onDeploymentPhaseStart
- modApi.events.onLandingPhaseStart
- modApi.events.onDeploymentPhaseEnd
- modApi.events.onPawnUnselectedForDeployment
- modApi.events.onPawnSelectedForDeployment
- modApi.events.onPawnDeployed
- modApi.events.onPawnUndeployed
- modApi.events.onPawnLanding
- modApi.events.onPawnLanded

## Events
- modApi.events.onGameStateChanged:dispatch(newGameState, oldGameState)
- modApi.events.onIslandLeft:dispatch(island)

Game States:
```
Main_Menu
Hangar
End_Game_Screen
Map
Island
Mission
Mission_Test
```