Harbour 3.0.0 (new formula).

Harbour is the free software implementation of a multi-platform,
multi-threading, object-oriented, scriptable programming language,
backward compatible with Clipper/xBase. Harbour consists of a compiler
and runtime libraries with multiple UI and database backends, its own
make system and a large collection of libraries and interfaces to many
popular APIs.

Harbour is a cross-platform compiler and is known to compile and run on
Windows (32 & 64), GNU/Linux, OS X, Windows CE, OS/2 and MS-DOS.

http://harbour-project.org/
harbour: add 3.0.0 bottle.

Closes #28609.

Signed-off-by: Misty De Meo <mistydemeo@gmail.com>