m_nationalchars Rebuild core hashmaps when the national_case_insensitive_map changes

Issue #923
m_nationalchars Rebuild the hash map in m_watch when the national_case_insensitive_map changes

Issue #923
m_spanningtree Rebuild serverlist and sidlist when receiving a specific Request

Issue #923
m_nationalchars Ask m_spanningtree to rebuild its hashmaps when the national_case_insensitive_map changes

Issue #923