Dhparser

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- dhparser script now creates and initializes project dir
- parsing is now based on a StringView class which other
than plain Python strings does not copy strings when
slicing. (Speeds up parsing for longer documents.)
- AST-transformations now receive the complete context, i.e.
the list of all parent nodes instead of just the node to
transform

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- compatibility fixes for Python 3.7

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- package now includes 'dhparser' script
- more transformation primitives for AST-transformation
- various bug fixes

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- test-suites can now contain test-data for tree-transformation
stages beyond AST, if their output is serializable as string.
- Support for the language server protocol via: DHParser/lsp.py
- reentry-points for resume and skip can now also be determined
with an EBNF-parser, and not only regular expressions as before.
- Documentation extended

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- Documentation extended
- Better support for error-reporting from preprocessors

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- refactoring: processing-pipeline-support now in a dedicated module