Update cmakelists, security.md and appdata

Update CMakeLists.txt and update UI

Merge pull request #353 from paolostivanin/dev

Release 3.5.2

Merge pull request #352 from paolostivanin/dev

Release 3.5.1

Merge pull request #351 from paolostivanin/newpr_rb

Release 3.5.0

Release 3.4.1

Merge pull request #344 from paolostivanin/dev3_4_0

Release 3.4.0

Merge pull request #334 from paolostivanin/paolostivanin-patch-1

Update SECURITY.md

Merge pull request #316 from paolostivanin/small_fixes

Small fixes to memory management

Update SECURITY.md