allow scenarios from any location to be started via command line
add edit command line function
Merge branch 'master' into cmdline-scenario
implement research_next_design
implement research_finish_item
Merge pull request #510 from zsilencer/master

use mixer for title music, crowd noise, rain/thunder, and sound effects
Merge pull request #514 from zsilencer/master

fix #513
Merge branch 'master' into research-update
fix various research issues and improve
Merge branch 'research-update'
move rain drawing functions into its own module
Merge branch 'master' into cmdline-scenario
refactor game startup and initialisation
improve command line parsing
Merge branch 'cmdline-scenario'
refactor various platform functions and includes
refactor openrct2 loop
refactor config and add window size
fix #516
Merge pull request #517 from nean/pickup-patch

Changed wrong assignment