Not just output anymore

Plorth has been missing very important feature for a very long time: Reading something from standard input. Well, not anymore, as you can read UTF-8 encoded text from standard input with read and nread words found from the global dictionary.

Improved comment parsing

Fixed critical issue in parsing of comments. Oh yeah, and also includes improvements in source code position tracking.

Improved error reporting

Errors now include information about the position in source code on which they occurred.

Reflection - uoᴉʇɔǝlɟǝɹ

Introduce new reflection API with it's own data types symbols and words.

Integers are back

Multiple bug fixes and reintroduction of integer numbers.

Now with 100% modules

Contains support for modules and some bug fixes.

Complete redesign of the language

• Add improved Unicode support.
• Simplify data types by dropping support for large numbers and
  integers. (At least for now.)
• Rewrite interpreter in STL style.

v0.0.1: Fix pop methods

Pop methods in execution context don't pop values from the stack if they
are not expected type.