strcut working
Merge branch 'gitignore_fix' into intertarget-code
Active negative test for string append
Changed Header: Copyright -> Maintainer
New basic architecture implemented.
Delete EditorBackend.hs

old editor file
Delete Menu.hs

old editor file
Delete EditorBackendTest.hs

old editor file
Delete Main.hs

old editor file
Delete Execute.hs

old editor file
some corrections in architecture
Editors architecture to docu
additional comments
some comments updated
Merge branch 'preproc-lexer'
Refactor Editor: fill TextAreaContent.hs
stack.ll separated into string.ll and stack.ll
tests script adjusted to new string.ll file
New archetecture for window and its elements.
created Highlighter.hs, added import in TextArea.hs