v4.5.2: package dependencies, CLI additions

Bugfixes

• Tokenize c'mon and $$$ 1e216de
• Tokenize 'email' 76b5a6b #1316
• Return empty mentions for empty document da08664 #1322
• Fix CLI protobuf tools running too fast for some network conditions: 412da5c

CLI protobuf tools

• Add output of lemmatizer to words 71bc95d
• Convert constituency trees to dependencies b118082

Dependency updates

• Protobuf 3.19.6 0439b62
• xom 1.3.8, which no longer automatically includes xalan 3ded6f0

Semgraph / Semgrex improvements

• Allow reuse of indices in SemanticGraph.valueOf cf97e36
• Add Semgrex relations to match the capabilities introduced in Spacy 98be52a