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Robin Getz
c29e491194
Unload the dynamically loaded VISA library when the VISA object is destroyed and ensure radio astronomy VISA sessions are closed first. Coverity reported a resource leak because `visaLibrary` was loaded with `LoadLibrary`/`dlopen` but was never released. It also identified uninitialized VISA function pointers and the library handle. Initialize the remaining pointers, add platform-specific library cleanup, and close all radio astronomy instrument sessions before releasing the default VISA resource manager. The other VISA users were reviewed to verify that their sessions and default resource managers are also closed before their VISA objects are destroyed. The library is only unloaded when no default resource manager session remains active, avoiding unloading the VISA library while it is still in use. Signed-off-by: Robin Getz <rgetz503@gmail.com>