Added Engine::{set_}scale()
amended Home.md
updated the wiki
Updated using modern CPlusPlus API (markdown)
Updated Home (markdown)
Updated Travis CI Administration Notes (markdown)
Updated _Sidebar (markdown)
Created Travis CI Administration Notes (markdown)
updated to match the upcoming commit
Updated using modern CPlusPlus API (dispatch) (markdown)
Updated using modern CPlusPlus interface v21 (markdown)
Updated using modern CPlusPlus interface v22 or later (markdown)