Set flag in all scripts to abort execution if command fails (#29)

scripts/0_setup.sh

@@ -1,6 +1,8 @@
 #!/usr/bin/env bash
 cd "$(dirname $0)/.."
 
+set -e
+
 mkdir -p .dfl
 mkdir -p workspace
 

scripts/env.sh

@@ -2,3 +2,5 @@ DFL_MAIN=.dfl/DeepFaceLab/main.py
 WORKSPACE=workspace
 
 source .dfl/env/bin/activate
+
+set -e