Trapping the script

Using these signals:
```
SIGHUP SIGINT SIGQUIT SIGABRT SIGTERM SIGTSTP
```

Fixed #272

CHANGELOG.md

@@ -1,5 +1,6 @@
 ## v10
 
+- Now we trap the script, so if it is cancelled, we will run cleanupAndExit anyway, and have mounted diskimages unmounted and temporary files and folders removed.
 -
 
 ## v9

fragments/arguments.sh

@@ -1,4 +1,9 @@
-# MARK: check minimal macOS requirement
+# MARK: 3 Arguments
+
+# Start trapping the script
+trap_with_arg func_trap SIGHUP SIGINT SIGQUIT SIGABRT SIGTERM SIGTSTP
+
+# check minimal macOS requirement
 autoload is-at-least
 
 installedOSversion=$(sw_vers -productVersion)
@@ -125,4 +130,4 @@ valuesfromarguments)
     fi
     ;;
 
-# label descriptions start here
+# Mark: label descriptions start here

fragments/functions.sh

@@ -1,4 +1,4 @@
-# MARK: Functions
+# MARK: 2 Functions
 
 cleanupAndExit() { # $1 = exit code, $2 message, $3 level
     if [ -n "$dmgmount" ]; then
@@ -29,6 +29,17 @@ cleanupAndExit() { # $1 = exit code, $2 message, $3 level
     exit "$1"
 }
 
+# Two functions to trap the script
+trap_with_arg() {
+    func="$1" ; shift
+    for sig ; do
+        trap "$func $sig" "$sig"
+    done
+}
+func_trap() {
+    cleanupAndExit 255 "Installomator has been terminated with: $1" ERROR
+}
+
 runAsUser() {
     if [[ $currentUser != "loginwindow" ]]; then
         uid=$(id -u "$currentUser")

fragments/main.sh

@@ -1,3 +1,4 @@
+# Mark: 4 Main
 *)
     # unknown label
     #printlog "unknown label $label"