Mark std.stdio.File.this(this), isOpen, name and getFP as `@safe`
Fix issue 12169 - sum(int[]) should return a int
Merge pull request #1966 from monarchdodra/issue12169

Fix issue 12169 - sum(int[]) should return a int
Fixup sum documentation
Merge pull request #1968 from monarchdodra/issue12169

Fixup sum documentation
Merge pull request #1964 from tom-tan/safe-some-methods-std-stdio

Mark std.stdio.File.this(this), isOpen, name and getFP as `@safe`