Update Taiwanese holidays
This patch improves upon @shrapnel's work on the accuracy
of the Taiwanese holidays file:
+ Some holidays are determined based on the Lunar Calendar, and their specific dates have to be manually specified for each year + Official holiday names are now used + Try to put a holiday in the correct categories
The following has been excluded:
+ Holidays (Festivals) for indigenous peoples (原住民族歲時祭儀) + Non-official holidays such as Halloween and Christmas
Differential Revision: https://phabricator.kde.org/D29223