Proj4011: Define INI keys once

An INI file is a plain text file with a structure and syntax comprising key–value pairs organized in sections.

Within a section of an INI file, defining the same key multiple times is redundant and can lead to confusion, as subsequent definitions will override previous ones. Each key should be defined at most once per section. Different sections can define the same key since they apply to different scopes.

Non-compliant

root = true

[*.cs]
indent_style = tab
indent_size = 4
indent_style = space

Compliant

root = true

[*.cs]
indent_style = space
indent_size = 4