WIP (work in progress).

Closes #218.

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

StringBuffer is a legacy synchronized class. StringBuilder is a direct replacement to StringBuffer which generally have better performance.

This was required by the Eclipse team as one precondition for the next
release.

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

After Ajc usage text output is filtered into its own category
IMessage.USAGE now - see commit @31b2d60b - some tests in module
'org.aspectj.ajdt.core' were failing. I fixed and also improved them a
bit.

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

Replace directory separator '/' and surrogate path separator ',' by
platform-specific separators File.separatorChar and
File.pathSeparatorChar, respectively. Also make sure that replacement
occurs during write access, not read access. This was handled
differently in both sibling classes.

I am not sure if that helps to fix any Linux CI tests, but it is worth a
try.

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

Signed-off-by: Lars Grefer <eclipse@larsgrefer.de>

Reports any String.indexOf() expressions which can be replaced with a call to the String.contains() method available in Java 5 and newer.

Signed-off-by: Lars Grefer <eclipse@larsgrefer.de>

Modified test expectation system so it is possible to say
the test cares about one particular message and the rest
do not matter (prefix message string with '*') - crude but
quick.

Polished many places to exploit generics

Upgraded all the tests to work on Java8 - some serious changes
regarding ajdoc on Java8. Hopefully it has stayed backwards
compatible with earlier JDK versions (e.g. if using AspectJ 1.8.3+
with a JDK less than 8) but no explicit testing done for this.

junit test suite based on an ajcTests.xml format test specification.