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 - Allow setting a prefix for the log collection filenames
 - Allow defining the max file size of the log collection files

Change API of linphone_core_enable_log_collection() to be able to deactivate the previous log handler.

Some booleans have been replaced by a state variable

This reverts commit 0c5309a3.

Unbreakable space should be also detected as valid for phone numbers (used by iOS to format contacts)