Changes

[Releng] Create a setup for CBI's p2 aggregator.

[Releng] Switch to Java 17.0.1.

[Releng] Regenerated catalogs for 2021-12 M3.

[Releng] Fix installer instructions links to ones with JREs.

[Releng] Regenerate the catalogs for 2021-12 RC1

[Releng] Regenerated catalogs for 2021-12 release.

[Releng] Update the setup for CBI's p2 aggregator.

[Releng] Regenerate catalogs for 2022-03 preparation.

[Releng] Update setup for 2022-03 (Oomph 1.24) development.

[Releng] Regenerate catalogs to avoid installing old version of
org.apachage.logging.log4j.

[Releng] Reset the version baseline for 1.24 development.

[577783] org.eclipse.oomph.util.AccessUtil doesn't work for Java 17

https://bugs.eclipse.org/bugs/show_bug.cgi?id=577783

[577811] Concatenated wizard progress page sentences should have a space
separator

https://bugs.eclipse.org/bugs/show_bug.cgi?id=577811

[577813] The p2 task does not properly analyze negative requirements

https://bugs.eclipse.org/bugs/show_bug.cgi?id=577813

[Releng] Add choices for eclipse.target.platform and
eclipse.api.baseline.target.platform

[577848] Avoid generating inappropriate GTK_IM_MODULE env for Linux
desktop links

https://bugs.eclipse.org/bugs/show_bug.cgi?id=577848

Change-Id: Ieb527fb22def6d039040d42510169866303fcd82

[577844] Cannot resolve requirements for Eclipse-2021-03

https://bugs.eclipse.org/bugs/show_bug.cgi?id=577844

[577848] Avoid generating inappropriate GTK_IM_MODULE env for Linux
desktop links

Ensure this compiles for Java 8.

https://bugs.eclipse.org/bugs/show_bug.cgi?id=577848

[Releng] Accommodate changes to the platform's org.eclipse.core.net
fragments.

[Releng] Accommodate changes to the platform's org.eclipse.core.net
fragments.

[577930] OwnershipMapper does not properly encode project names

It would be better to remove trademark/registered symbols such that the
encoding is not so relevant.

https://bugs.eclipse.org/bugs/show_bug.cgi?id=577930

[Releng] Create a p2.index for composite repositories.