2.1.0

• Converted to build as a stand-alone EPICS module
• Switching back to 3-component version numbers for this release (but not semver).
• Fixed use-after-free bug.
• Removed obsolete JS_FILEWAIT and PIOC code.
• Added support for Perl Compatible Regular Expressions, using the implementation from the ca-gateway module. Improved the configuration of which regex engine to compile with, now in configure/CONFIG_SITE.