DonateCase

Plugin:

• Added new saving data "Count of opened cases"
• Added cache for placeholder retrieving
• Added async MySQL requests
• Added new "index" option for items. Also added sorting by this index
• New placeholders: %donatecase_open_count% %donatecase_open_count_format% %donatecase_open_count_case% %donatecase_open_count_case_format%
• Code refactor API:
• Extracted Data.yml logic from CustomConfig to YamlData class
• Added async methods for getting data: Case#getAsyncSortedHistoryData Case#getKeysAsync
• Added new methods for managing "Count of opened cases": Case#getOpenCount Case#getOpenCountAsync