Add dev container, fix bugs in compiler setup (#20)

Features added:
* Add clang include directory to cfg
* Adding statiging release
* Add dev container
* Add runtime library interface
* Adding first version of unistd.c
* Adding print for exit code at debug exit

Bug Fixes: 
* Fix bugs in compiler cfg template
* Fix namecmp to recognize substrings as non equal
* Fix abi thread local issue, add test program build to top level cmake project
* Fix makro in cmake template
* Fix debug to handle unlimited number of input items or input-/outputsets

Author: tom-kuchler

.github/workflows/release_experimental.yml

@@ -1,9 +1,10 @@
-name: release latest with all library versions
+name: release experimental with all library versions
 
 on:
-  pull_request:
+  push:
     branches: [ "dev/staging" ]
 
+
 jobs:
   build:
     strategy: