Experimental branch - 5th era community testing

We've finally progressed with probably the biggest update so far - the 5th (electrified) era!

Today, I've updated experimental branch with brand new content so for those who are brave enough, let's switch there and help us find last several bugs and finish this great update together!

It is hard to point out what is new, so here you have at least main changes:

• 4 new locos (3 electric, 1 diesel), 6 new wagons (1 quest wagon)
  
• 3 new industry buildings with upgrades
  
• 2 new buildings without upgrades
  
• 6 new quests, 1 era quest
  
• 1 new cargo type
  
• 1 new track type, new depot
  
• new sounds, particle, camera positions, fixes, features, visual effects, etc.
  
• fields! 3 types atm.
  
• all textures switched to compressed format (small disk requirements, faster streaming)
  
• new render features like Fresnel Glossiness and Glass rendering
  
• first colorize overlays (currently track type visualization) to help you see the overall situation
  
• and lot more..
  

you may find detailed changelog here https://trello.com/c/byaZAlXq/103-27th-april-2019

Please use Discord bugreport: https://discord.gg/s8PnRS and thanks a lot for any comment or bug report.

Hope you will like it ;) and thanks all of you for your time!

Best,
Jan