Code Review

This pull request refactors chat-related code. However, it introduces significant security regressions, specifically Cross-Site Scripting (XSS) vulnerabilities. These arise from the removal of HTML encoding for job titles in AI tracking links and the failure to sanitize speaker names in the refactored colorize_name procedure. Beyond security, there are also recommendations for improving code readability and style guide adherence, such as a style guide violation in code/modules/mob/hear_say.dm concerning conditional operators and a missing comment for a 'magic number' in the normalize_char_code() procedure.