v0.29.0

• Added dsinit! symbol.
• Added sealed? and sealed-sigil? symbols.

• floor and ceil now correctly return an integer again.

• Added abs symbol.
• Now executing min shell if no file is specified (unless input is piped in), without the need of specifying -i.
• Implemented the possibility to define type classes using the typeclass symbol.
• Added stringlike? symbol.
• Implemented support for generics in operator signatures
• Now listing what items are polluting the stack.