Changes to BC and behavior in version 5.4

Changes to BC and behavior in version 5.4
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INI setting changes
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Change of behavior
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- EZP-23296: Template Block Cache has cache key collisions

  The template cache blocks where using crc32 which has a high probability of collisions.
  Feature has been changed to use md5 like viewcache already uses.

  Note: To avoid that you have to many cache blocks take advantage of putting identical once in
  own template so they will share cache (template and location of block is part of internal unique key).

- EZP-26028: Unable to use Online Editor when using PHP7

  To fix this issue, first parameter of all XML input and output handlers, `$xmlData` can not be a reference anymore.


Removed features
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- EZP-23082: completely remove ezsearch_return_count table

  The table ezsearch_return_count is not used by Exponential anymore, so simply remove it.
  This drastically decreases the size of the database for huge sites.


Removed constants
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Removed globals
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Deprecated
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