Replace more addresses with their named constants

Also named window.var_4B2/4 as saved_view_x/y
add news window
Merge branch 'master' of https://github.com/IntelOrca/OpenRCT2.git
Merge branch 'update_addresses' of https://github.com/ZedThree/OpenRCT2 into ZedThree-update_addresses
Merge branch 'ZedThree-update_addresses'
Merge branch 'upstream-master'

* upstream-master:
  add news window
  Replace more addresses with their named constants