Codemetapy

* Fix incorrect parsing of version from dependencies (closes 48)
* Java/Maven: translate organization from pom.xml to schema:Organization (type was missing)
* Check e-mail validity when inferring a maintainer
* Metadata update

Features:
* python: support "homepage" and "documentation" fields from pyproject.toml, limited support for "readme" too
* python:parse maintainers from pyproject.toml 44
* npm: support 'maintainers' field in package.json 44
* updated to latest codemeta crosswalks (proper v3 compatibility is coming in the next codemetapy release)

Bugfixes:
* python: fix incorrect parsing of versions from dependencies if e.g. extras are stated to be installed 42
* npm: ensure url is retained for all contributors 45
* ensure lists are always sorted in some way so output is deterministic 39
* we eagerly turn literals into resources when they exist in our graph; exempt certain properties like 'url' from this behaviour 46

* Split off all HTML generation code to a seperate project codemeta2html: https://github.com/proycon/codemeta2html
* prevent unnecessary URI remapping
* set pyshacl version fixed to 0.20.0, versions 0.22.0 break stuff; to be re-evaluated later
* better detection of json-ld for --addcontextgraph
* more robust URI generation
* added load function for API usage
* web: extract title from h1 if no title found in head

Bugfix release:

* Remove stub targetProducts (i.e. without url) for web applications/services if we have better ones (i.e. with url)
* Minor fix in verbose log output
* Removed some itemss from deviant context, no longer needed
* Nodejs: fix for contributors parsing
* html visualisation: fix for screenshot display
* html visualisation: also allow screenshots and references on targetproduct pages

* nodejs: fixing parsing of contributors
* nodejs/npm: remove the scope from the name in conversion to codemeta
* Implemented support for converting Rust's Cargo.toml 10
* added --addcontextgraph parameter to add information to the context graph but not to the JSON-LD context
* expand implicit id nodes also when there is a known namespace prefix (CLARIAH/tool-discovery33, CLARIAH/tool-discovery34)
* fix recursion problem in item embedding, and skip embedding for certain acyclic properties
* implemented direct parsing of pyproject.toml 28 CLARIAH/tool-discovery35
* if labels have a language, always choose english (for now)
* minor style fixes for frontend
* allow merging heterogenous developmentStatus
* java: resolve ${project.groupId} and ${project.artifactId} variables
* improved own codemeta metadata

Bugfix release:

* collide blank-nodes that have exact the same content (assume same URI), should solve issue 36