refactor formatter to provide format() method and strip comments when format=compressed

[robocoder]

No description provided.

[clue]

Thanks for the PR, but I'd like to vote against using regular expressions to remove comments.

My current compress working branch is a bit of a mess, but I'd rather go for a similar approach that introduces a new additional API to the formatter to remove comments from the output.

I'll see if I can send in some dedicated PRs as well.

[robocoder]

I'll revert my change for issue 60 given that scssphp isn't compatible with the ruby version to begin with:

/* comment */
a {
    /* comment */
    color: red; /* comment */
    /* comment */
}
/* comment */

/*! comment */
b {
    /*! comment */
    color: red; /*! comment */
    /*! comment */
}
/*! comment */

/*
 * multi-line comment
 */
c {
    /*
     * multi-line comment
     */
    color: red; /*
                 * multi-line comment
                 */
    /*
     * multi-line comment
     */
}
/*
 * multi-line comment
 */

/*!
 * multi-line comment
 */
d {
    /*!
     * multi-line comment
     */
    color: red; /*!
                 * multi-line comment
                 */
    /*!
     * multi-line comment
     */
}
/*!
 * multi-line comment
 */

// comment
e {
    // comment
    color: red; // comment
    // comment
}
// comment

scss produces:

/* comment */a{/* comment *//* comment */color:red;/* comment *//*! comment */}b{/*! comment *//*! comment */color:red;/*! comment *//*
 * multi-line comment
 */}c{/*
                 * multi-line comment
                 *//*
     * multi-line comment
     */color:red;/*
 * multi-line comment
 *//*!
 * multi-line comment
 */}d{/*!
                 * multi-line comment
                 *//*!
     * multi-line comment
     */color:red;/*!
 * multi-line comment
 */}e{color:red;}

ruby scss (3.1.15 and 3.2.7):

a{color:red}/* comment */b{/* comment */;color:red;/* comment */;/* comment */}/* comment */c{color:red}/*
 * multi-line comment
 */d{/*
 * multi-line comment
 */;color:red;/*
 * multi-line comment
 */;/*
 * multi-line comment
 */}/*
 * multi-line comment
 */e{color:red}