Overhauls the scripting layers (GenericRepl and related, and JSR223 and related)
Adds repeating modes (none, only latest eval'd line, or random order)
Also adds better thread-safe IO capturing, default imports, SimpleRepl wrapper, more unit tests
NOTE: the script-util part of the pull request was rejected due to various problems and incompatibilities.
It may be incorporated into the code later.
(originally cherry picked from commit 6f7d517)
apatrida
5ad06e1e92