Data Structure Access Speed optimizations and Prototype Inheritance for OOP

0.4.0 (2020-02-27)

• Feature: Added std:to_no_arity for disabling arity checks for functions.
• Feature: Added std:strengthen for weak refs and weakening refs.
• Feature: Added std:num:int_to_open01, std:num:int_to_closed_open01
  and std:num:int_to_open_closed01.
• Feature: Added std:rand:split_mix64_next_closed_open01 and
  std:rand:split_mix64_next_open_closed01.
• Feature: Added basic prototyped object orientation.
• Optimization: Unrolled argument processing for function calls.
• Optimization: Unrolled GetKey operations.
• Change: std:to_drop disables arity checks for drop functions.
• Change: Optimized a few hot spots.
• Change: While optimizing I made arithmetic operations compiler syntax and not
  functions anymore.
• Change: Symbols are handled equally to strings internally now, also improves
  performance a bit when accessing maps.
• Bugfix: Basic arithmetics are now wrapping and don't panic on overflow anymore.
• Bugfix: Parser used unwrap() in some places where an EOF was not expected.
  These errors are now handled properly.
• Bugfix: Protect against division by 0 and make a wlambda panic from it.