Eclipse Compiler 19f448f47c (15Dec2022) - Java19

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

In messages_aspectj.properties, set compiler.version to
"Eclipse Compiler 5fd28398cc (21Sep2022) - Java19".

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

- JDT Core dependency in pom.xml
- Constants.java
- LangUtil.java
- AjcTask.java
- messages_aspectj.properties

- XMLBasedAjcTestCaseForJava17Only.java
- XMLBasedAjcTestCaseForJava18*.java
- tests/bugs199
- tests/features199

- JavaVersionCompatibility.md
- README-199.html

- GitHub CI build

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

After JDT Core (ECJ) was updated to the final Java 17 feature set, the
tests now pass as expected.

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

The resource key 'misc.usage' is completely gone from
.../jdt/internal/compiler/batch/messages_aspectj.properties. Instead,
JDT Core was adjusted in such a way as to patch the new resource key
'misc.usage.aspectj' into the upstream 'misc.usage' in the right place.

Now finally the properties file is as lean as I envisioned it to be,
without any loss of information and without the need of future manual
synchronisation of duplicate texts for every release.

At the same time, usage text detection in AjdtCommand::inferKind was
improved and also adjusted to the new situation.

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

- Use spaces instead of tabs for indentation.
- Document parameters bound in Eclipse JDT, e.g. {0} is not the compiler
  name there but the system's path separator ';' or ':'. So if we want
  to display the compiler name, we need {1}.
- For both normal usage and '-X' usage, compiler name + version are
  printed now.

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

Delete all properties from messages_aspectj.properties which were just
copied from Eclipse and basically the same. This not only gets rid of
duplicates but also eliminates differences found between upstream and
AspectJ strings which were just cause by errors or oversights during
manual upgrade.

TODO:
  - Find a way to print the '-X' options as info instead of yielding
    'abort', making it seem as if compilation failed and print the usage
    message to stdErr instead of stdOut.
  - Eclipse also has misc.usage.warn, not just misc.usage, i.e. usage
    info specifically for warning options. Make sure that AspectJ uses
    it consistently.
  - Find a way to merge AspectJ-specific options into the standard
    Eclipse usage text instead of completely replacing it, further
    reducing the need to merge and copy upstream content.
Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

Renamed messages.properties to messages_aspectj.properties and moved to
a path identical with the Eclipse original resource file. Therefore, it
is now just treated as a localised version of it.

The new jdtcore-for-aspectj.jar already contains logic to use the new
locale. Hence, BuildArgParser no longer needs the static block to
initialise its own resource bundle, Eclipse JDT will automatically pick
it up.

The version string was also updated to the new Eclipse merge commit
hash + date + "Java16".

TODO: Strip down properties file in order to only contain delta to
Eclipse.

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

Added 1.7.3 test suite