Make std.string.chomp @safe
Make std.string.chomp pure
Make the constructor of std.string.StringException @safe and pure
Finalize new API,  more examples

Also fix issue 9579.
address review comments
Merge pull request #1470 from blackwhale/regex-new-api-2

Finalize new API, more examples
Merge pull request #1481 from tom-tan/safe-string-StringException

Make the constructor of std.string.StringException @safe and pure
Merge pull request #1480 from tom-tan/safe-string-chomp

Make std.string.chomp @safe
fix debugging versions, make them truly independent
centralize escapables, kill "prefix comma continues a line"
space around operators batch #1
space around operators batch #2
space around operators batch #3