Modify template modes amd add "Text" template mode about thymeleaf HOT 5 CLOSED

When this is done, org.thymeleaf.util.TemplateModeUtil should be modified. See also this: #167

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As there are 3 possible values for the th:inline processor, maybe there should be 3 "text template modes", TEXT, JAVASCRIPT, DART.

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Given 3.0 will completely revamp the parsing and DOM system, it will be a much more reasonable point to modify the template mode system than 2.1. So this ticket has been moved to 3.0.

In fact, given the flexibility given by the new parser to be used in 3.0 (attoparser), we should study the possibility to establish only two template modes:

• Markup
• Text (which should not only be allowed to use on its own, but also enabled when th:inline="text")

Note 1: Would Markup be enough for HTML and XML? if not... should we drop the XML support altogether?
Note 2: Processors should be made available for either Markup or Text, or maybe both. For example, all HTML-attribute based thymeleaf attributes like th:src, th:ref, etc. would make no sense in Text. But th:each would.
Note 3: Syntax for Text mode should be well integrated with (or be the same as) the syntax finally developed for #68 and maybe also #47.

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Developed as a part of the new Thymeleaf 3.0 architecture and template modes. See #391 and #395

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Already in 3.0.0-SNAPSHOT

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