Fix Issue #8298, Don't throw exceptions on broken symlinks.

Using dirEntries to loop trough all the files/directories in a directory
will curently throw an Exception when encountering an broken symlink.

Whit this change DirEntry will no longer throw an Exception for broken
symlinks, but in that case isDir and isFile will return flase while
isSymlink returns true.
fix Issue 11403 - functions in std.algo can't be used as pred
Merge pull request #1819 from monarchdodra/equalEqual

fix Issue 11403 - functions in std.algo can't be used as pred
Fixup commit a8177b8cc3300fd64eef0acb7397be15fb0e0b4c

Per https://github.com/D-Programming-Language/phobos/commit/a8177b8cc3300fd64eef0acb7397be15fb0e0b4c#commitcomment-4991972 :
"nothrow" was superfluous
Merge pull request #1839 from monarchdodra/cycle3

Fixup commit a8177b8cc3300fd64eef0acb7397be15fb0e0b4c
Merge pull request #1841 from blackwhale/issue-8203

fix issue 8203, similar issue with lookaround
Merge pull request #1838 from blackwhale/issue-11839

Fix issue 11839
Merge pull request #1837 from blackwhale/issue-11808

Fix issue 11808 std.uni.CodepointSet('А', 'Я'+1, 'а', 'я'+1) asserts
Merge pull request #1142 from MikeWey/Issue8298

Fix Issue #8298, Don't throw exceptions on broken symlinks.
Merge pull request #1842 from blackwhale/issue-11350

Fix issue 11350 ibphobos2 regex match segfaults when a rare HTTP header is received
Remove trailing white
Remove tabs
Fix issue 11884 - std.container.Array lacks a constructor from an input range
Merge pull request #1844 from monarchdodra/fix11884

Fix issue 11884 - std.container.Array lacks a constructor from an input ...
Document that replaceSlice returns a new array
Merge pull request #1848 from eco/patch-11

[minor] Document that replaceSlice returns a new array
Fix two WEB DDoc macros
Merge pull request #1849 from eco/patch-12

[minor] Fix two WEB DDoc macros
std.string: Fix redundant UTF decoding in chomp
Merge pull request #1850 from CyberShadow/std-string-chomp

std.string: Fix redundant UTF decoding in chomp