modernize Test2

[rurban]

Now that the blocker in B::Deparse aux_list is fixed with eb4914f96b2d1248474ed649372d00c3d7fbf2c6 we can update Test-Simple to Test2 (done with 84e05dc33e17ae934e6a29bbaeef4494b1310665) and modernize it again, as done with the old version. It's not that slow anymore.

See feature/gh205-Test2 squash the previous modernization commits into one for future easier updates.

36da9ca sigs: use in Test::Simple 1.001014c
2ec4868 libs: sanitize cperl VERSION suffices
2661aa8 types: fix Test::Simple tests (WIP)
2f5b9ac Test-Simple: fix PERL_CORE @INC
bd4b813 Test-Simple: avoid fake_signature for import
0c30ca7 win32: todo cpan/Test-Simple/t/subtest/fork.t
4fa19ec Bump Test-Simple to 1.401014c
28ea24e Test-Simple: relax skip types
999744c CPAN: fix t/subtest/fork.t MSVC check
5ab4794 Test-Simple: run t/is_deeply_with_threads.t in CORE
223e183 signatures: fix cx_dup #163
7bc2a5e Test-Simple: BAIL_OUT(str $reason="")

[rurban]

Well, it's still too slow. 20% slower with pure Test-Simple 1.302059, made 4% faster with modernization of Test-Simple to 1.402059c (Test2 not yet). But maybe we can get there.