BRO1516: Use braces consistently

When one clause of an if/else chain has braces, all of them do. Replaces StyleCop SA1520.

Example

Before

public class Tariff
{
    public decimal Rate(int zone)
    {
        if (zone == 1)
        {
            return 0.5m;
        }
        else
            return 1m;
    }
}

After

public class Tariff
{
    public decimal Rate(int zone)
    {
        if (zone == 1)
        {
            return 0.5m;
        }
        else
        {
            return 1m;
        }
    }
}

Why

A chain that mixes clauses with and without braces is harder to scan, and the clause without braces is the one that gets a second statement by mistake.

How the fix works

Like BRO1514.

Not reported

• A multi-line clause when BRO1515 is on: that rule reports it (like StyleCop).
• The cases BRO1514 skips.

Compared with StyleCop

Same positions and output, apart from the skipped cases.