## Summary
Migrates the eight concrete New Guild System gumps (CreateGuild, GuildInfo,
GuildMemberInfo, GuildRoster, GuildDiplomacy, WarDeclaration,
GuildAdvancedSearch, GuildInvitationRequest) and three abstract bases
(BaseGuildGump, BaseGuildListGump, OtherGuildInfo) from the legacy `Gump`
class to `DynamicGump`. Layout work moves from constructor-side `AddX(...)`
calls into `BuildLayout(ref DynamicGumpBuilder builder)` — the abstract
`BaseGuildGump` now provides a `BuildContent` callout for shared
tab-strip chrome, and `BaseGuildListGump<T>` adds another
`BuildListExtras` hook so subclasses can paint highlighted titles after
the filter/sort/pagination chrome.
The headline win is the **self-refresh pattern** on the list gumps and
diplomacy advanced search. Previously each filter/sort/back/forward
click allocated a brand new gump via `GetResentGump`. After migration,
those handlers mutate `_filter`, `_startNumber`, `_comparer`, `_ascending`,
or `_display` on the existing gump and call `from.SendGump(this)`,
letting the singleton path in `NetStateGumps.Send` swap in the same
instance with the new layout. The original list is preserved separately
from the per-render filtered/sorted `_displayList`, so refreshes pick up
the latest state without losing the source list.
All guild gumps deal with per-instance dynamic strings (guild names,
member names, war declarations, alliance names), which would defeat
`StaticGump<T>` caching per the cliloc rule, so every concrete subclass
migrates to `DynamicGump`. `AllianceRosterGump` (in `Misc/Guild.cs`)
is a `GuildDiplomacyGump` subclass and inherits the new behavior; its
unused override and stored alliance reference were dropped along with
the now-obsolete `GetResentGump` abstract.
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