refactor(mkdockerbuild): extracts common parts (#24)

* fixes mount of project in wrapper scripts, when not running in container

* refactors makefile in preparation to extract common parts

* refactors makefiles and scripts

* fix git ignore matches

* adds support to disable fetch

* update

* fixes docker warning about unused build argument

* adds support to force offline build

fixes shell escaping
changes paths to relative where possible

* moves make docker builder support files

* removes unnecessary configuration elements

* fixes initial download directory creation

* adds missing rule for initial download directory creation

* fixes docker error: unable to prepare context

copies dockerfile to build context, in order to remove dependency to
unsupported/new docker feature

.gitignore

@@ -1,4 +1,4 @@
-.vscode
-.build
-.deps
-.settings/language.settings.xml
+/.vscode/
+/.build/
+/.deps/
+/.settings/language.settings.xml