[TextServer] Add support for retrieving OpenType name strings.

[bruvzg]

Add method to get OpenType name strings, which contain localized name and other font information. Was made to get sample texts for better font selection/preview, unfortunately seems like most fonts do not have samples (only 5 from 500 on my system do). But it might be useful for something else.

Example of the returned Dictionary:

{
    "en": {
        "copyright": "© 2012 DynaComware Taiwan Inc. All rights reserved.",
        "family_name": "HanziPen SC",
        "subfamily_name": "Regular",
        "unique_identifier": "HanziPen SC Regular; 14.0d1e1; 2018-06-12",
        "full_name": "HanziPen SC Regular",
        "version": "14.0d1e1",
        "postscript_name": "HanziPenSC-W3",
        "trademark": "HanziPenSC W3 is a trademark of DynaComware Taiwan Inc.",
        "designer": "DynaComware Taiwan Inc.",
        "vendor_url": "http://www.dynacw.com",
        "typographic_family_name": "HanziPen SC",
        "typographic_subfamily_name": "Regular" 
    },
    "zh-cn": {
        "family_name": "翩翩体-简",
        "subfamily_name": "常规体",
        "full_name": "翩翩体-简 常规体",
        "typographic_family_name": "翩翩体-简",
        "typographic_subfamily_name": "常规体" 
    },
    "zh-tw": {
        "family_name": "翩翩體 簡",
        "subfamily_name": "標準體",
        "full_name": "翩翩體-簡 標準體",
        "typographic_family_name": "翩翩體-簡",
        "typographic_subfamily_name": "標準體" 
    } 
}

[akien-mga]

Could use a rebase for good measure, just for the sake of minimizing the diff between the original commit and latest master.

[bruvzg]

Could use a rebase for good measure

Done.

[akien-mga]

Thanks!