Include the semantic of relational operations

[meevee98]

I'm converting everything to Kotlin because I was having too many problems with Null Pointer Exception with Java. #1 is the current list of what has to be done for now.
While is everything being refactored, should be good to check the current behaviour of the relational operations in the semantic phase.

Relational Operations:

• Equality
  • Allowed to integer, boolean and character operands, with both operands having the same type
  • The result is always a boolean value
• Inequality
  • Allowed to integer, boolean and character operands, with both operands having the same type
  • The result is always a boolean value
• Greater than
  • Allowed to integer, rational and character operands, with both operands having the same type
  • The result is always a boolean value
• Greater than or equal
  • Allowed to integer and character operands, with both operands having the same type
  • The result is always a boolean value
• Less than
  • Allowed to integer, rational and character operands, with both operands having the same type
  • The result is always a boolean value
• Less than or equal
  • Allowed to integer and character operands, with both operands having the same type
  • The result is always a boolean value