* adjusts to CPU architecture by reading `uname -m`
* `wayland-native` option for Wayland flags
* `remove` option to delete downloaded files
* generates Desktop entry from template
* `--no-sandbox` flag when unprivileged usernamespaces are not available
* downloads various icon sizes to correct locations
* uses reverse DNS notation so icon can be overridden by icon themes
* add `GenericName`, `Comment`, and `Keywords` to Desktop file
* add `SingleMainWindow` to tell DEs not to suggest opening a new window
* add `StartupWMClass` - probably not required but doesn't hurt either
* update accompanying README instructions
* remove previous example `.desktop` file
