Twig new

During the last two days I implemented a few improvments:

• Doku
• first Base-Templates
• add stores to context
• Bug: 10.twig = must start with single quote only
• Bug: vars passed to twig are not availabel TS afterwards

Unittests would still be nice to have, but I think it's better to integrate this now and improve later then to wait any longer.

Documentation/Manual.rst

@@ -797,6 +797,8 @@ QFQ Keywords (Bodytext)
  +-------------------+---------------------------------------------------------------------------------+
  | <level>.content   | | *show* (default): content of current and sub level are directly shown.        |
  |                   | | *hide*: content of current and sub levels are stored and not shown.           |
+ |                   | | *hideLevel*: content of current and sub levels are stored and only sub levels |
+ |                   | | are shown.                                                                    |
  |                   | | *store*: content of current and sub levels are stored and shown.              |
  |                   | | To retrieve the content: `{{<level>.line.content}}`. See `syntax-of-report`_  |
  +-------------------+---------------------------------------------------------------------------------+