Bugfix for the bugfix

Panic? At the backout!

Change most error sets to error{OutOfMemory}

It doesn't make a lot of sense for functions where that's the only case
to handle to use a larger superset.

Make diffCleanupSemantic public

Remove unneeded conditional in diffCommonSuffix

Add build.zig.zon, update build.zig, .gitignore

This adds a test running step and a zig.zon manifest.  Also adds to the
.gitignore the new location of caches, .zig-out.

More paths, .target, .optimize

Module name is diffz, not DiffMatchPatch

scm, fix: Update build to use `b.path` (ziglibs#20)

scm, fix: Update build to use `b.path` (ziglibs#20)