Move step running into enum for dynamic ordering (#1188)

Co-authored-by: Stuart Reilly <sreilly@scottlogic.com>

src/steps/os/android.rs

@@ -1,10 +1,10 @@
 use crate::command::CommandExt;
 use crate::execution_context::ExecutionContext;
+use crate::step::Step;
 use crate::terminal::print_separator;
 use crate::utils::require;
 use crate::utils::which;
-use crate::Step;
-use color_eyre::eyre::Result;
+use color_eyre::Result;
 
 pub fn upgrade_packages(ctx: &ExecutionContext) -> Result<()> {
     //let pkg = require("pkg")?;