General clean up
Several doc comments are not up to date and the default path to leading to TypoScripts of a package is wrong.
Also, the TypoScript parser should be Singleton.
[TASK] Clean up TypoScript package
This patch contains some cosmetic cleanups and fixes of doc comments.
Furthermore it makes Parser a singleton and fixes the default path
pattern leading to TypoScripts of a package. That didn't have any
bad effect before, because the Phoenix package overrides the default.