Fixes visitors in GoType.
Implements assignability test in GoTypeInterface and GoTypeStruct.
Remove unsed LOG in GoTypeName.
The base of GoCallOrConvExpression can be either a type or a expression. Rename getBaseExpression() to getBase()
GoTypes.fromPsiType does not return null.
Include GoPsiTypeParenthesizedImpl in GoElementVisitor. GoTypes.fromPsiType is not using recursive visitor.
Fixes one test case.
Fixes GoTypeInspectUtil in constant expression case.
Decoupling resolver from PsiReference in order to resovle method without a MethodReference from the source code.
WIP