**Problem**
sbt -V tries to show both the sbt version and the runner version,
and ends up creating target directory even on a non-sbt directory.
**Solution**
If the current directory doesn't have a build, just display the runner version.
**Problem**
1. Currently users are automatically opted into -create-sbt,
somewhat implicitly.
2. When somehow they are not, the check mechanism currently blocks for input.
**Solution**
1. Support a new location for sbtopts file under XSG_CONFIG_HOME/sbt
2. Rename -create-sbt to --allow-empty, and don't opt everyone in
3. Exit 1 instead of blocking for input
Fixes#7387
* Fix VM argument passing by .sbtopts file and JAVA_TOOL_OPTIONS environmental variable, improve launcher script integration test setup
* Fix sbt process not exiting in launcher test for --sbt-version
* Fix JAVA_TOOL_OPTIONS in launcher for linux/mac
Fixes#6530
Ref #6101
Problem
-------
Although having sbt server up by default is beneficial to well-tested
platforms like macOS, on less tested setups various native and/or
native-adjacent techniques we use could end up causing instability.
Solution
--------
This adds `--no-server` as a quick way of telling sbt not to start up
the sbt server or create virtual terminal.
Eugene Yokota
friendseeker
Domantas Petrauskas
João Costa
Eric Peters