SEStrUtils.cs

static class StrUtils
{
    static string cRef =
"\n\n\n\n\n" +
"\n'|¦ˉ‘’‚" +
"\nј" +
"\n !I`ijl ¡¨¯´¸ÌÍÎÏìíîïĨĩĪīĮįİıĵĺļľłˆˇ˘˙˚˛˜˝ІЇії‹›∙" +
"\n(),.1:;[]ft{}·ţťŧț" +
"\n\"-rª­ºŀŕŗř" +
"\n*²³¹" +
"\n\\°“”„" +
"\nґ" +
"\n/ijтэє" +
"\nL_vx«»ĹĻĽĿŁГгзлхчҐ–•" +
"\n7?Jcz¢¿çćĉċčĴźżžЃЈЧавийнопсъьѓѕќ" +
"\n3FKTabdeghknopqsuy£µÝàáâãäåèéêëðñòóôõöøùúûüýþÿāăąďđēĕėęěĝğġģĥħĶķńņňʼnōŏőśŝşšŢŤŦũūŭůűųŶŷŸșȚЎЗКЛбдекруцяёђћўџ" +
"\n+<=>E^~¬±¶ÈÉÊË×÷ĒĔĖĘĚЄЏЕНЭ−" +
"\n#0245689CXZ¤¥ÇßĆĈĊČŹŻŽƒЁЌАБВДИЙПРСТУХЬ€" +
"\n$&GHPUVY§ÙÚÛÜÞĀĜĞĠĢĤĦŨŪŬŮŰŲОФЦЪЯжы†‡" +
"\nABDNOQRSÀÁÂÃÄÅÐÑÒÓÔÕÖØĂĄĎĐŃŅŇŌŎŐŔŖŘŚŜŞŠȘЅЊЖф□" +
"\nљ" +
"\nю" +
"\n%IJЫ" +
"\n@©®мшњ" +
"\nMМШ" +
"\nmw¼ŵЮщ" +
"\n¾æœЉ" +
"\n½Щ" +
"\n™" +
"\nWÆŒŴ—…‰" +
"\n" +
"\n" +
"\n" +
"\n\n\n\n\n" +
"\n" +
"\n";

    static string kRef =
"\nЖв?ж?" +
"\nъв>" +
"\nьв>" +
"\nҐ,?-?.?‚?„?…?–?—?š>œ>à>á>â>ã>ä>å>æ>ç>è>é>ê>ë>ð>ñ?ò>ó>ô>õ>ö>ø>ù?ú?û?ü?ž?ā>ă>ą>ć>ĉ>č>ď>đ>ě>ē>ĕ>ę>ĝ>ğ>ń?ň?ō>ŏ>ŕ?ř?ś>ŝ>ş>ș>ũ?ū?ŭ?ů?ų?ŵ?ź?Ц>Ш>Ы?Ю?б>в?ж?н>";

    static Dictionary<char, int> cW;
    static Dictionary<char, Dictionary<char, int>> kP;

    static StrUtils()
    {
        cW = new Dictionary<char, int>();
        int w = 0;
        foreach (char c in cRef)
        {
            if (c == '\n')
                w++;
            else
                cW[c] = w;
        }


        kP = new Dictionary<char, Dictionary<char, int>>();
        Dictionary<char, int> cur = null;

        for (var e = kRef.GetEnumerator(); e.MoveNext();)
        {
            char c1 = e.Current;
            e.MoveNext();
            char c2 = e.Current;

            if (c1 == '\n')
                kP[c2] = cur = new Dictionary<char, int>();
            else
                cur[c1] = c2 - 64;
        }

    }

    public static int Kern(this char left, char right)
    {
        if (kP.ContainsKey(left))
        {
            int w;
            kP[left].TryGetValue(right, out w);
            return w;
        }
        return 0;
    }

    public static int Width(this char ch)
    {
        int w;
        cW.TryGetValue(ch, out w);
        return w;
    }

    public static int Width(this string str, char lead = '\0')
    {
        char lc = lead;
        int wd = 0, w;
        foreach (var c in str)
        {
            cW.TryGetValue(c, out w);
            wd += w + 1;
            if (kP.ContainsKey(lc))
            {
                kP[lc].TryGetValue(c, out w);
                wd += w;
            }
            lc = c;
        }

        return wd;
    }
}

This is NOT how I normally write a code. This one was done for Space Engineers ingame script, Ingame Scripts have length limit (100 000 characters). Also, where was no way to attach separate data section, so, all data was need to be stored in script itself.