Remove tr///; it's been done.
Remove a couple of static optimizer tasks.

These are better handled by dynamic optimization, and indeed already
are by inlining on MoarVM (thanks to spesh) and the JVM (thanks to
invokedynamic). Thus they are not Rakudo codebase tasks.
Add (+)'s check for empty input to (.).
Fix consecutive heredoc parse with Windows \r.

We failed to swallow enough after the stopper in this case, meaning
that two consecutive heredocs led to an extra newline appearing in
the second one.
Merge branch 'nom' of github.com:rakudo/rakudo into lax
inherit strict setting into EVALs