Western Star and Freightliner Cascadia Improved Dashboards

Changes 1.2.5: fixes an error that appeared while driving the Western Star 49X.

Features: adds a remaining-fuel indicator to the Western Star 49X and older Freightliner Cascadia dashboards, with a slightly larger font for clarity; adds a numeric cruise-control speed readout next to the speed icon on the Cascadia and 57X digital dashboards; adds a speed-limit indicator, an estimated job-completion time, and a remaining-fuel display to the Cascadia and 57X digital dashboards; and adds a retarder icon to the digital dashboards.

Credits: Nemesys