Added excel export for  AuswertungContracts.
Added excel export for  AuswertungContracts.

# Conflicts:
#	module_contracts/admin/reports/AuswertungContractsOpen.php
#	module_contracts/lang/module_contracts/lang_contracts_de.php
#	module_contracts/lang/module_contracts/lang_contracts_en.php
#	module_contracts/system/ReportCfgContract.php

Squashed commit of the following:

commit 00261d322a1fa5bab96b1a2aa0563c26e89ef1fd
Merge: bccc3bef5 1d6419bf3
Author: andrii.konoval <andrii.konoval@artemeon.de>
Date:   Thu Jan 3 11:50:40 2019 +0100

    Merge branch 'releases/v7.0' into feat/agp-2253_Contracts-reports-excel-export

commit bccc3bef5ddf630c538201b425ef7ab7892ae621
Author: andrii.konoval <andrii.konoval@artemeon.de>
Date:   Tue Dec 18 12:49:07 2018 +0100

    fix(system, contracts, auswertung): Moved AuswertungReportBaseContractExport.php in auswertung module to AuswertungReportExport.php in contracts module.
    Added addLogicalDeleteRestriction

commit 084bdcbc4b3a7cef65d66341c8f671c20601304f
Author: andrii.konoval <andrii.konoval@artemeon.de>
Date:   Fri Dec 14 13:21:18 2018 +0100

    fix(system): CS fix

commit 1812fb7525fac89797636d7fd7311b922d5c80a2
Author: andrii.konoval <andrii.konoval@artemeon.de>
Date:   Fri Dec 14 13:00:20 2018 +0100

    fix(system, contracts): Reworked query with select per list with system id to select with subselect.

artemeon/core,artemeon/core,artemeon/core,artemeon/core,artemeon/core