fix issue 13163 - std.conv.parse misses overflow when it doesn't result in a smaller value
don't bother with signed types

Everything is >= 0 all the time anyway.
fix whitespace
Mark std.file.getFileAttributesWin as trusted and makeUlong as safe pure
nothrow nogc
Made File.writeln infer @safe/@trusted/etc. Also wrapped stdout in @trusted private function so writeln (and family) free functions don't always infer @system.
Merge pull request #2381 from tom-tan/trusted-file-getFileAttributesWin

Mark std.file.getFileAttributesWin as trusted and makeUlong as safe pure nothrow nogc
Mark std.file.readText as trusted
Merge pull request #2378 from tom-tan/trusted-file-readText

Mark std.file.readText as trusted
Merge pull request #2233 from rbanderton/fix-writeln-inference

Fix Issue 6644 - std.stdio write/writef(ln) are not @trusted
Merge pull request #2355 from NilsBossung/13163

fix issue 13163 - std.conv.parse misses overflow when it doesn't result in a smaller value