Overhaul exchange automation and refactor the codebase

[mikkelpetersen]

Summary

This PR contains two layers of work on the plugin: a set of automation features built on top of the current main, followed by a full code-quality refactor of the whole codebase.

Feature work

• Market ratios from panel memory — ratios are read directly from the exchange panel (MarketRateGet/MarketRateGive and the OfferedItemStock competing listings) instead of scraping the ratio tooltip. Optionally lists at the highest competing ratio (Use Highest Competing Ratio), with a Require Sufficient Stock filter.
• InputHumanizer integration — a Use InputHumanizer toggle routes mouse input through the InputHumanizer plugin when it is loaded, with SyncTask input plumbing pumped in Tick() and controller release once a batch finishes. Keyboard input and the fallback path stay on the plugin's own Win32 SendInput wrappers (layout-independent Unicode typing).
• Multi-sell — a "Mark" column in the owned-items window queues multiple items and sells them as a batch, capped at the free trade slots (Maximum Concurrent Trades minus placed orders). A stuck item is skipped on timeout instead of aborting the batch.
• Collect all — collects filled and canceled orders via Ctrl+right-click, verifying inventory space per order (partial-stack aware), pacing collections with a configurable delay because of trade rate limits, and aborting when no progress is made.
• Runtime UI discovery — all UI elements (sell button, currency select buttons, picker search input, order collect slots) are discovered at runtime by text/geometry instead of hardcoded child indexes.
• UI/settings overhaul — resizable "Owned Items" window with an optional pin to the exchange panel, one randomized base action delay instead of per-purpose delays, and settings reorganized into Interface/Pricing/Timing/Input/Advanced/Excluded Currencies groups.

Refactor

• All inline comments replaced with XML documentation on the relevant members.
• .NET naming conventions applied throughout, including the Win32 interop wrappers; AvailableMarketRatio.cs renamed to MarketRatio.cs; MarketRatio and SellSequenceStep moved into the SellMyShit namespace.
• Dead code removed (unused sort-header helpers, unused caches and methods, unused enum member).
• Small fixes: the debug message list is capped at 200 entries, the table's DefaultSort flag follows the configured default sort column, and the wanted-item resolution is null-guarded.
• All user-facing strings reviewed for proper English grammar.

Testing

• Builds cleanly with dotnet build (0 errors; only the two pre-existing warnings about obsolete ExileCore APIs).
• Sell, batch-sell, and collect sequences verified in-game against the live currency exchange panel during development.

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