CH7 Additional modes

ch7 options on Mission Planner/Windows feature more items in the
drop-down than are offered on APM Planner. Adding the additional
modes here.
Add in the CH7/8 Land Option
Linux Installer - first commit of auto-build and packager for Linux
Linux Installer - Fixed up permissions and menu entry
Linux Installer - Add entry to main menu
Linux Installer - removed en_au language specifier
Linux Installer - Added readme
Added extra install instructions for OSX on how to run an unsigned binary
Resolves #59: Quick Actions still disabled after reconnect
Added Context Menu to modify the lower four shortcut modes.
Dialog added to AdvParamView to download parameters for Iris - Part 1 (fixed list)
Fix to URL to download the file, not the HTML page for Iris.param