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Introduce `ScriptCommand` class that parses a command line into a script name
and optional args, using bash-like quoting and escaping. `ScriptCommand`
searches for a file with that script name on a passed list of directories; the
directories may be specified relative to a particular base directory.
`ScriptCommand` supports the special case of a script name containing unescaped
spaces. It guarantees that either the returned script file exists, or its
`error()` string is non-empty.
Replace `LLLeap::create()` logic, from which `ScriptCommand` was partly
derived, with a `ScriptCommand` instance.
Make `LLLUAmanager::runScriptFile()` use a `ScriptCommand` instance to parse
the passed command line.
Subsume `LLAppViewer::init()` script-path-searching logic for `--luafile`
into `ScriptCommand`. In fact that lambda now simply calls
`LLLUAmanager::runScriptFile()`.
Make `lluau::dostring()` accept an optional vector of script argument strings.
Following PUC-Rio Lua convention, pass these arguments into a Lua script as
the predefined global `arg`, and also as the script's `...` argument.
`LuaState::expr()` also accepts and passes through script argument strings.
Change the log tag for the Lua script interruption message: if we want it, we
can still enable it, but we don't necessarily want it along with all other
"Lua" DEBUG messages.
Remove `LuaState::script_finished_fn`, which isn't used any more. Also remove
the corresponding `LLLUAmanager::script_finished_fn`. This allows us to
simplify `~LuaState()` slightly, as well as the parameter signatures for
`LLLUAmanager::runScriptFile()` and `runScriptLine()`.
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