Fix 0011166: Complex types could not be entered with newline chars

When setting complex configuration values via Manage Configuration =>
Configuration Report, newline characters weren't parsed correctly. This
meant that users had to enter complex array types on a single line.

This patch resolves the issue by stripping newline characters from any
complex type entered. It also applies a few other fixes to the parsing
of complex array types.

Bugs do remain and this complex array parsing is still very limited. The
current problems are:

• An inability to parse multidimensional arrays
• Array keys and values cannot contain commas or "=>"