[Issue 18110] most of phobos should be @safe-ly useable

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18110

Seb <greensunny12 at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |greensunny12 at gmail.com
         Depends on|                            |18154, 13607, 14445, 14439


Referenced Issues:

https://issues.dlang.org/show_bug.cgi?id=13607
[Issue 13607] BigInt math not usable in @safe code
https://issues.dlang.org/show_bug.cgi?id=14439
[Issue 14439] aa's keys, values, byKey, byValue not usable in @safe context
https://issues.dlang.org/show_bug.cgi?id=14445
[Issue 14445] std.net.curl not usable in @safe code
https://issues.dlang.org/show_bug.cgi?id=18154
[Issue 18154] std.process should be usable in @safe
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