1. When web search was open, because it had no id, it would steal the links clicked for the in-viewer browser, now it identifies as search and will not.
2. Work around an oddity with the browser being unresponsive to certain category only slurls, by temporarily removing the expected behavior of it returning as last seen when reopened (no setVisible(false) in onClose, just close out as normal)
Added "Use web-based search instead of legacy v1 search" checkbox to System->General preferences
Unified all functions to display search floater into toggle_search_floater and LLFloaterSearch::showInstance
Added UseWebSearch and UseWebSearchSLURL debug settings for flexible configurations
- SLURLs with legacy search cannot always present the same results as web
Added SearchURL debug setting, a separate setting from the one used in the all tab, slightly different and always set by response["search"] on OSGrid logins to detect if websearch is supported
Cleaned up llfloaterdirectory includes and added "Search.WebFloater" to the CommitCallbackRegistrar in case we ever want to add a button or something to open web search (couldn't find a nice place for it, sadly), also added more functions to show specific tabs and performQueryOn to search a tab with specific query on LLPanelDirBrowser's
