Add greedy charset option to string argument

[Owen1212055]

This implements the concept of "greedy charsets" for brigadier string argument types.

Currently, word / quotable phrase arguments have a strict charset. For quotable phrase arguments, you can simply wrap the argument in quotes to allow these characters. However, for word arguments, you cannot use other characters at all. This is quite limiting, as even characters as simple as = are not allowed. This also blocks pretty much all international characters, making these argument types inconvenient to use.

In order to keep backward compatibility, a new "greedy charset" field has been added to the string argument types. This allows words/quoted strings to allow a much wider range of characters. StringReader also now has "greedy" methods, which will act as a way to have this functionality in other custom argument types if wanted. This means that any previous use of the argument/StringReader methods will use the legacy behavior.

Word argument

Before:

Note: Word arguments can't even be quoted, so it's impossible to use these characters.

After:

(with greedy charset)

String argument

Before:

After:

(with greedy charset)


Note, that we no longer need to wrap the argument in quotes with these characters.

Fixes

Fixes #103
Fixes #44

[0x000006]

Seems good to me.