New upstream version 1.4.18

SECURITY.md

pom.xml

xstream-benchmark/pom.xml

xstream-distribution/pom.xml

xstream-distribution/src/content/CVE-2020-26217.html

xstream-distribution/src/content/CVE-2020-26258.html

xstream-distribution/src/content/CVE-2020-26259.html

xstream-distribution/src/content/CVE-2021-21341.html

xstream-distribution/src/content/CVE-2021-21342.html

xstream-distribution/src/content/CVE-2021-21343.html

xstream-distribution/src/content/CVE-2021-21344.html

xstream-distribution/src/content/CVE-2021-21345.html

xstream-distribution/src/content/CVE-2021-21346.html

xstream-distribution/src/content/CVE-2021-21347.html

xstream-distribution/src/content/CVE-2021-21348.html

xstream-distribution/src/content/CVE-2021-21349.html

xstream-distribution/src/content/CVE-2021-21350.html

xstream-distribution/src/content/CVE-2021-21351.html

xstream-distribution/src/content/CVE-2021-29505.html

xstream-distribution/src/content/CVE-2021-39139.html