Fixes #7333

Problem

The sbt launcher script used naive word splitting when parsing .sbtopts and .jvmopts, so arguments with spaces were split incorrectly. For example, -J--add-modules jdk.incubator.concurrent in .sbtopts and -Dtest.key="value with spaces" in .jvmopts were not passed to the JVM as intended.

Solution

Parsing was updated to be quote-aware. A new parseLineIntoWords() helper splits lines while respecting single and double quotes. loadConfigFileIntoArray() loads config files into bash arrays: for -J lines it splits the remainder and prepends -J to each token (e.g. -J--add-modules jdk.incubator.concurrent → -J--add-modules and -Jjdk.incubator.concurrent); for other lines it uses quote-aware splitting. .sbtopts now uses loadConfigFileIntoArray instead of loadConfigFile; .jvmopts uses loadConfigFileIntoArray and merges the result into java_args instead of appending via JAVA_OPTS string concatenation.

Testing

Two integration tests were added in RunnerScriptTest.scala: one for -J--add-modules jdk.incubator.concurrent in .sbtopts, and one for -Dtest.7333="value with spaces" in .jvmopts, both verifying that the full values are passed correctly to the JVM.