Improvements on admin screens

[hugosolar]

Applications for approval

• Datatables integration on applications
• Green mark for MC members to check for already voted applications
• Add a filter to list Individual, institutional or both applications
• Add a tab to show MC members voting count

List Members*

• Datatables integration on members list and Total Individual Members by Country
• Add a date filter (with datepicker integration)
• Add a filter to list Individual, institutional or both
• Add a button to show the current filtered email list
• Add a tab to search members across the site by email, ID or username and execute certain actions like reset the vouching state (because cannots) and change vouchers

Backend Stuff

• Added WP-API custom endpoints to retrieve network information to be used in the datatables