[TYPO3-core] RFC #16845: Better API for Update Wizards in the Install Tool

[Benjamin Mack]

Hey,

this is a SVN patch request.

Branches: trunk

Type: visual improvement / cleanup

BT reference: http://bugs.typo3.org/view.php?id=16845

Problem:
The Update Wizards in the install tool lack of some things that might be
helpful:

 * A proper API to give the wizards a title
 * A proper API to let the user know whether the update wizard should be
shown
 * A possibility to go to the next update wizard once you're done with one
 * A better visible divider between each update wizard
 * A nice introduction for people so they understand what the update
wizard does.

Solution:
 * Create an abstract base class that takes care of the basic
functionality of an update wizard (it also has the documentation for the
functions that can be implemented)
 * Modify some markers to have a consistent look+feel when performing
the updates.
 * Create some texts and fields to have the "Go to next update wizard"
button and the introduction text above all update wizards.


Additional Information:
Of course there are more things that can be improved further.

 * Clean API function to display whether an update wizard does dbQueries
or not
 * Clean API if the update worked or not, with visual feedback a la
FlashMessages with different state


All the best,
Benni.
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