std.process: Add workDir parameter
fix 'jobserver unavailable: using -j1' warning for $(SUBMAKE)

- Problem is that make doesn't recognize $(SUBMAKE) as
  make, so it won't pass MAKEFLAGS and doesn't use it's
  jobserver.

- Fixed by explicitly using $(MAKE) ...

For reference:
http://www.gnu.org/software/make/manual/html_node/Error-Messages.html
http://www.gnu.org/software/make/manual/html_node/MAKE-Variable.html#MAKE-Variable
Merge pull request #1928 from CyberShadow/std-process-cwd

std.process: Add workDir parameter
Merge pull request #1912 from MartinNowak/makeJobServer

fix 'jobserver unavailable: using -j1' warning for $(SUBMAKE)
Introduce UTF Matchers into std.uni.

It's a step zero to get decode-less std.regex.
UTF matchers are efficient functors around a set of
specific tries. Enables processing Unicode characters
without decoding at speeds on par with decoding itself.

Along the way make staticIota at 'package' protected and reuse it.

Fix a shameful typo in setSearcher.
workaround stable sort (std.move) not CTFE-able
const/pure annotations
purify std.uni constructs, blocked by std.algortihm.sort
@safety bags for utfMatchers

Granularity is horribly high. Auto-inference for templates has the
downside that it, leaves no explanations or reasons for failure.
fold in review comments