Merge armem/dev into refactor/new_arch(_armem)

@fratty Maybe we can do this together? There are some merge conflicts due to changes that where necessary on the previous state of armem/dev (due to usages in dependent projects)

added 14 commits

• 2cf6d599...ca9477b7 - 10 commits from branch refactor/new_arch_armem
• df14a47e - Merge branch 'master' into armem/dev
• 780dea3f - Allow passing server memory to disk ltm
• 8ca0bb3e - Fix differing signedness
• ee063d86 - Add virtual destructors

Compare with previous version

merged