fixes Issue 9054 - std.net.curl byLineAsync and byChunkAsync broken.
Fix12609 - Remove dead code assignment.
fix Issue 12394 - Regression: std.regex unittests take agonizingly long to run - like hours on OSX
Merge pull request #2098 from WalterBright/fix12394

fix Issue 12394 - Regression: std.regex unittests take agonizingly long ...
Fix Issue 12608 - Avoid dead assignments.
Merge pull request #2097 from AndrejMitrovic/Fix12609

[Trivial] Fix12609 - Remove dead code assignment.
Merge pull request #2096 from AndrejMitrovic/Fix12608

[Trivial] Issue 12608 - Avoid dead assignments.
Merge pull request #2086 from tcsc/master

fixes Issue 9054 - std.net.curl byLineAsync and byChunkAsync broken.
a start on std.regex conversion

few steps more
hacks on the way to integrate new uni into std.regex
workaround internal error
adjust Tries back to 2-level
another minor tweak, always use tries not sets for now
hack our way to make ctRegex work, some tests disabled
Kickstart not quite ready, casefolding too. Otherwise looks fine
introduce simpleCaseFolding to support case-insensitive regex
fix range violation for non-existant sets of length < 2
make simpleCaseFoldings CTFE-able
get our case-insensitive regex back
reanble kickstarter engine in std.regex