2.0.0 changelog

*Improved Tech Tree*
- reworked all vehicles
- 6 distinct generations of vehicles (DATE RANGE)
- many engines added
    - still aim to keep one obvious choice per route, but with a wider spread of engines
    - clear distinction between engine roles
    - some engine names kept for continuity with v1, the rest renamed
    - much more comprehensive electric engine roster
    - expanded diesel and electric railcars, available from (START DATE)
    - all stats rebalanced, including power, speed and costs 
- high speed and very high speed trains
- many more types of passenger, mail and freight wagons
    - list types added
    - vehicles, intermodal and supplies cars are missing from v2 vs v1, may be restored in future
    - removed combine cars, they don't work with autoreplace 
    - reset capacities so that wagon length is purely a visual choice
- see gameplay guide

*Improved Visual Appearance*
- reworked style of all sprites
- many vehicles have multiple livery options (random, or when vehicle is flipped in depot)
- all vehicle lengths now 4/8, 6/8, 8/8, 10/8, or 12/8
    - easy to make tile length trains
    - or don't bother
- depot flip enabled in many cases
    - Iron Horse 1 couldn't do this
- updated visual effect handling
    - more accurately positioned visual effects
    - rear lights on consists
    - electric engine pans are dropped / raised if on elrl (or not)
    - doors open on many vehicles when loading/unloading

*General Improvements*
- cargos
    - updated cargo support for FIRS etc
    - better default choices when first default isn't available (climates, FIRS economies)
- buy menu information for trains

*Online Docs
- improved display of trains
- better navigation

*Translations*
- multiple languages updated

*Codechanges*
- super rework of much code
    - faster compiles
    - no longer everything articulated
    - revamped graphics generation
        - automated buy menu sprites
        - automated cargo sprites
        - automated chassis and roofs
        - automated pantographs
    - shared library of cargo sprites, cargo refits etc with Road Hog and Unsinkable Sam
    - much refactoring