Complete Refactor for target/bin (#1654)

* documentation and script updates trying to fix #1647
* preparations for refactoring target/bin/
* complete refactor for target/bin/
* changing script output slightly
* outsourcing functions in `bin-helper.sh`
* re-wrote linting to allow for proper shellcheck -x execution
* show explanation for shellcheck ignore
* adding some more information

target/bin-helper.sh

@@ -0,0 +1,16 @@
+#! /bin/bash
+
+# version   0.1.0
+# executed  from scripts in target/bin/
+# task      provides frequently used functions
+
+function errex
+{
+  echo "${@}" 1>&2
+  exit 1
+}
+
+function escape
+{
+  echo "${1//./\\.}"
+}