Various fixes for DoS vulnerabilities.

[jandupej]

The following changes are included:

• Increased referenced Newtonsoft.Json version to 13.0.3 and fixed stack overflow when deserializing very deeply nested objects, in C#
• Added recursion depth checks while deserializing in java, maximum depth can be set with DeserializerControls.setMaxDepth
• Increased gbc version to 0.13.0.0
• Added recursion depth checks while deserializing in C++, maximum depth can be set with bond::SetDeserializeMaxDepth
• Increased minimum supported .NET Framework version to 4.6.2
• Fixed handling of unknown BondDataType in Compact/FastBinaryReader.SkipType, in C++
• Added recursion depth checks while deserializing in C#, depth can be set with DeserializerControls.MaxDepth and defaults to 64
• Improved build instructions for C++, C#, Java