0.2.5 - More fixes!

We're focusing on the new Endless mode right now, but we’ve made a bunch of fixes in the meantime:

• We’ve removed the length limit for bridges, and the geographical restriction on Horseshoe Isle is enforced differently now
• Stations can be extended
• We’ve made a number of UI improvements: there is text shown when there are no active contracts rather than ablank box; train warnings are replaced by a text warning when you are paused; toggle buttons have been altered to be more consistent; and there is a background colour change to indicate when a contract is active

Thanks as always for the feedback!