More refactoring of rights checks (#61)
* Refactor predefined_expenses.tpl to use rights checks
* Refactor notifications.tpl to use rights checks
* Refactor invoices.tpl to use rights checks
* Refactor projects.tpl to use rights checks
* Update users.php
* Refactor desktop projects.tpl to use rights checks
* Refactor expenses.php to remove stray canManageTeam() call
* Refactor mobile users.php to remove stray canManageTeam call
* Refactor mobile expenses.php to remove stray canManageTeam() call
* Refactor time.php to remove stray canManageTeam call