pom.xml changes:
- lower compile source/target to 1.7 (from 1.8, introduced with Javassist 3.24.0)

There were minimal changes:
Some tests had their own runners these were discontinued as IDEs/maven run the tests anyway.
Removed the main methods for these.
2 tests were dependent on the running order so added the test sorter.

All tests succeed on junit 4 with legacy support.

In order to squash the mvn build warnings.

In order to squash the mvn build warnings.

Move the test output folder 'runtests' to target or build directory so that mvn clean can clean that.

The following warning when invoking `mvn versions:display-plugin-updates` does not appear anymore:
```
[WARNING] Some problems were encountered while building the effective model for org.javassist:javassist:bundle:3.19.0-GA
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-compiler-plugin is missing. @ line 137, column 15
[WARNING] 'build.plugins.plugin.version' for org.apache.maven.plugins:maven-jar-plugin is missing. @ line 160, column 15
[WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten the stability of your build.
[WARNING]
[WARNING] For this reason, future Maven versions might no longer support building such malformed projects.
```

To get the test case JvstTest4.testMethodParameters() to work
the <testSource> and <testTarget> elements are set to "1.8"
and the compiler argument "-parameters" is added.

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