Better RK forum

Improves the Renaissance Kingdoms game official forum. This extension improves the official forums of the game "Renaissance Kingdoms". It adds the following to both official forums and the Rome forum: - Filters for the forum index. - Filters for new post search pages. - An ignored accounts filter for topic pages. - New post icons on the forum index. - Buttons for using additional tags when writing posts (spoiler, char, center, etc.) (inspired by jdOrandin). Each feature can be enabled or disabled individually in the extension options. Each filter (whitelist, blacklist, ignored accounts) can be applied by default when the page loads if the user wishes (configurable in the extension options). <b>Whitelist and blacklist:</b> The extension adds four buttons when visiting the index or one of the new post pages ("View posts since your last visit", "View your posts", "View unanswered posts"): - "Filter whitelist": shows only categories on the whitelist. - "Filter blacklist": removes categories on the blacklist from view. - "Clear filters": removes the filters to restore the original list. - "Show/hide settings": shows or hides the settings. To define the whitelists and blacklists, enter the categories you want to show or exclude in the corresponding text fields in the settings section. Category names must be separated by semicolons. The lists are separate for each of the three forums. The settings are saved locally in the browser and applied once the page is reloaded. <b>Ignored accounts list:</b> The extension adds three buttons when reading a topic: - "Filter ignored": replaces posts from ignored accounts with neutral text. - "Clear filters": removes the filters to restore the original display. - "Show/hide settings": shows or hides the settings. To define the ignored accounts list, enter the accounts you want to ignore in the corresponding text field in the settings section. Account names must be separated by semicolons. The list is shared across all three forums. The settings are saved locally in the browser and applied once the page is reloaded. <b>New post icons:</b> On the forum index, this feature changes category icons to indicate that new posts have been made. Whether posts are considered "new" is based on the last visit date shown on the forum index and the dates of the latest posts in the categories. It does not depend on whether those posts have been read. <b>Writing tags:</b> Inspired by jdOrandin, this feature adds buttons to post editing windows (topic replies or private messages) for the tags center (center alignment), right (right alignment), spoiler, sup (superscript), sub (subscript), char (character sheet), hr (solid horizontal line), hr-dashed (dashed horizontal line) and hr-dotted (dotted horizontal line).