Differentiate between statics in setters and getters

[TymurGubayev]

Problem

#1054: Statics with same name in getter and setter cause a CONVERSION ERROR

Solution

• Any comments on the approach taken, its consistency with surrounding code, etc.
  The solution is basically to store accessor kind in every IdentifierNameSyntax of a static, and to use that value later when doing the renaming.
• Which part of this PR is most in need of attention/improvement?
  Currently, it creates _Prop_b and _Prop_b1, which is fine, but it would be nicer to get _Prop_Get_b and _Prop_Set_b instead. This is easy to achieve if every static from a property would get that infix. It's a bit more cumbersome if only those with duplicate name would get one.
• At least one test covering the code changed