The crash happened if connection timed out while there were unread object inventory offers.

EXP-1742 FIX -- Clicking IM notification or receiving multiple IM notifications in quick succession crashes to desktop

* Moved toast logic for mouse hover out of the draw call to avoid chain of callbacks that lead to reordering of the draw list while we are iterating over it.

SH-2738: Texture fetching freezes due to LLcurl
SH-2777: viewer crashed on logout in LLCurl::Easy::releaseEasyHandle

Reviewed by Richard.

force all floaters to have follows flags = FOLLOWS_NONE and use llfloaterview::reshape logic instead
removed existing follows flags from any floater XUI and deprecated the follows parameter for floaters

Fixed broken resize indicator on Linux viewer window (EXP-1580).

Implemented new requirements from XD: "Profile window should keep last size,
regardless of whether it was own profile or another users'.
If multiple windows open, last one touched is the size we store."