Official Demo + Major Game Rework  [0.1.0]

Changelog:

### Added 
- New Mini Boss 
- New Ranged Shop 
- New Ranged Civ 
- New Builder Shop 
- New Builder Civ 
- New Train Civ 
- Now you can swap the Civilian you have selected to move forward (Press C) 
- Loot rooms have now been added to the map 
- Mutant nests will now spawn on the map, expand, and spawn mutants 
- Added Vietnamese, Brazilian, and Swedish translations 
- New sounds and random selection added to most objects and NPCs 
- Rank system perk has been added, and the more kills, the higher the rank they can achieve 
- Barbed Wire perk has been added, which will slow down mutants when close to barricades 
- Damage boost building - Health boost to barricade building 
- Added tutorial videos (Can be disabled in settings or after the first game)  
### Changed 
- Full UI rework 
- Full game code rework to easily expand game mechanics 
- Wave system has been reworked to allow the addition of special waves 
- Fog will now only reach the stage where you built the barricade 
- New Train model - Barrels have now been added back to the map 
- Lights added to the map to enhance the level's atmosphere 
- Barricade models have been changed 
- Attacks have been reworked for both Civs and Mutants  
### Fixed 
- Openlevel will no longer crash the game 
- FPS will no longer affect bullets or walking speed