Limit the size of the cache of latex parsed strings (bug #59546). * graphics.in.h (gh_manager::latex_data): New typedef moved from latex_renderer. (m_latex_cache, m_latex_keys): New data members. A map of cached latex_data and a list of keys. The latter allows for deleting the oldest entries when the cache becomes too large. (gh_manager::get_latex_data, gh_manager::set_latex_data): Cache accessor functions. * latex-text-renderer.cc: Remove global latex_cache variable. (latex_renderer::text_to_strlist,latex_renderer::render): Use the gh_manager to handle the cache.

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