[installer] [host] fix for files not downloading with .gz extension
[installer] [host] .remove on constructed qstring!
[installer] [host] extract to proper path
[installer] [host] win32: fix translation location; add mt manifest
signing so we run as Administrator
[installer] [host] 1/2 add README.md to explain build process
[installer] [host] 2/2 add windows build info