Added multiple new features.

Added the following:

• Collectable Journal entries from the terminal to the Glove Menu.
• Checkpoint system triggered by objective updates or collecting key cards.
• Modular mission objective system for easier level creation.
• More dialog triggers.
• Signal receivers now turn off after activation.
• A way to turn off the UI in the camera mode to assist with recording footage.

Bug fixes:

• Fixed bugs related to audio cutting off after re-spawning.
• Fixed bugs with the new loading system.
• Fixed bugs with the player rag-doll.