JSON parse error for "\/"

[Frank-Buss]

The "tiled" editor creates a JSON file like this:

    "source":"..\/..\/desert.tsx"

This results in a parse error. According to Wikipedia (https://en.wikipedia.org/wiki/JSON) it should be valid: "For example, escaping a slash (/) with a backslash () is valid in JSON". This would fix it in LexerUtils.cs#UnescapeLuaString:

    else if (c == '/') { sb.Append('/'); escape = false; }

[Joy-less]

This has since been fixed in commit 714c265.