Mach IPC and fixes

This release upgrades the internal messaging from unix sockets to mach messages. Everything should be a bit faster and more reliable.

Additions:

• popup background shadows
• alias color override
• XNU mach IPC

Fixes:

• Fixed some slow memory leaks

Deprecations:

• the cache_scripts property is deprecated. All scripts must now be chmod +xed, this was not necessary prior when
  setting the cache_scripts property to true.

Full Changelog: v2.4.3...v2.5.0