Create RemoveAllChestsPlugin.cs

This plugin removes all chests in the current world.
Create RemoveAllUnlockedChestsPlugin.cs

This plugin removes all unlocked chests in the current world.
Create UnlockAllChestsPlugin.cs

This plugin unlocks all chests in the current world.
Update ViewModelLocator.cs

Added plugin entries for three newly added plugins.
Update ChestEditorView.xaml

Now you can edit the name of the chest.
Merge pull request #524 from betenner/master

Add three new plugins, chest edit view can now edit chest name.