• Add method getFlatProjectionFromAST, which returns projection only for first level
• toInputObjectType now works with TypeComposer, rather than GraphQLType (if TypeComposer already has InputType, then it does not generate new one)
• Clear types' fields, if they are ObjectTypes without fields.
• Rename GQC methods:
  • typeComposer to get
  • setType to add
  • hasType to has