Feature email when vote starts

See merge request !18

Send E-Mail When Voting Period Starts and use templates for all emails that are sent to users, Issue #10, Milestone !1

export outcome of the election, issue #9

See merge request !17

Voters can apply themselves and CSV files can be used to add voters

See merge request !16

* option to enable voters to apply for elections, added new option in the election creation page
* CSV files can now be used to scale up voter creation for the Hausadminwahl

Addresses Issue #2

See merge request !15

Issue #2: Added possibility to add anonymous voters for voters where the email is not known. The tokens can then be downloaded via PDF, printed and distributed analogue.