Restrict use of java.io.File to 5 methods (excluded), but otherwise ban.
This is a prerequisite to do any mocking here.
I don't try to do any heavy cleanup on these tests, I am not familiar with them.
So this is mostly a rote straightforward conversion.
Closes#8836
This commit cuts over all of core (not quite all tests) to java.nio.Path
It also adds the file class to the core forbidden APIs to prevent its usage.
This commit also resolves#8254 since we now consistently useing the NIO Path
API. The Changes in this commit allow for more information if IO operations fail
since the NIO API throws exceptions instead of boolean return values. The build-in
methods used in this commit are also more resillient to encodeing errors like
unmappable characters and throw exceptions if those chars are present in a file.
Closes#8254Closes#8666
When removing and installing again the plugin all configuration files will be removed in `config/pluginname` dir.
This is bad as users may have set and added specific configuration files.
During an install, if we detect already existing files in `config/pluginname` directory, we simply copy the new file to the same dir but we append a `.new` at the end.
Related to #5064.
(cherry picked from commit 5da028f)
(cherry picked from commit 4cb1f95)
