COMMON & WINTERMUTE: Use non-1252 for 125X games (PR 1698)

* WINTERMUTE: Add detection for "The Driller Incident"

"The Driller Incident" is a small freeware game for Wintermute,
avaliable in English and Russian: http://questzone.ru/enzi/files/1645

* WINTERMUTE: Add detection table for "One Helluva Day" demo

"One Helluva Day" is a point-and-click adventure demo in English / Czech
/ Russian.
Free download:
https://store.steampowered.com/app/603680/One_helluva_day/

* WINTERMUTE: Support CHARSET property for TT fonts

"// we don't need this anymore" was a mistake =)

Surely, most Wintermute games are either designed for 1252 language
(DE_DEU, EN_ANY, ES_ESP, FR_FRA, IT_ITA, PT_BRA), or don't use TrueType
fonts (5ma, deadcity, grotter1, grotter2, thekite, tib), or use
CHARSET=1 with UTF strings (dirtysplit, reversion1, reversion2, twc),
which meen this conversion is not needed for those games.

However, there are some games that explicitly states CHARSET=10 (driller
(RU_RUS), oknytt (RU_RUS), onehelluvaday (UNK_LANG when playing as
Russian)) and there are some games with CHARSET=1 with non-1252 in mind
(bookofgron (RU_RUS excepts 1251), carolreed4 (RU_RUS excepts 1251),
kulivocko (CZ_CZE excepts 1250)).

This fixes text in some games: bookofgron, carolreed4, driller, kulivocko,
oknytt, onehelluvaday.

* WINTERMUTE: Break savegame compatibility

sizeof(BaseFontTT) was changed, so let's break savegame compatibility

* COMMON: Add conversion tables for win1253 and win1257

* COMMON: Add string conversion from U32String back to Common::String

convertUtf32ToUtf8 code is based on Wintermute::ConvertUTF32toUTF8
convertFromU32String use convertUtf32ToUtf8 for UTF8 or lookup through
conversion table for single-byte encodings

* WINTERMUTE: Use Common::convert functions for non-UTF charsets

* WINTERMUTE: Fix whitespaces at detection tables

* WINTERMUTE: Add TODO comments

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