Added "try-catch" to all build-setup steps

This was the only way I knew how to display the step at which the build-setup process failed.
I've personally experienced failures at multiple of the build steps, and before I got used to Chipyard,
it was hard to figure out which step was the culprit. With this, users should have a bit more info to
troubleshoot their issues. For some of the build steps that required multiple lines, I figured it made
more sense to put them into a sub-script, rather than putting a && at the end of each line. But for the
firesim one for example, since it was two .sh calls, I just put a && after the first one, inside of the
try block, to make sure both lines run.

scripts/build-step-precompile-firesim-scala.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+
+# This script is intended to be used as a sub-step of build-setup.sh.
+pushd $CYDIR/sims/firesim
+(
+    echo $CYDIR
+    source sourceme-manager.sh --skip-ssh-setup
+    pushd sim
+    make sbt SBT_COMMAND="project {file:$CYDIR}firechip; compile" TARGET_PROJECT=firesim
+    popd
+)
+popd