Fix 14 issues found in ticket backlog

[kristofbolyai]

This PR includes a huge amount of fixes of unrelated things. These are all the issues I found looking through all tickets. Some of these are just null-checks, some are slight reworks of systems. All of these were tested to some level, some crashes were tested by their ticket owners as well.

I know that this PR seems like a mess, but if reviewed commit by commit, it is easy to navigate. I also think that making 15 PRs is not the way to do this.

List of fixes and their issues:

• https://github.com/Wynntils/Wynntils/commit/936fd31c3ffd527216f8a836617f2f18d778ef57 fixes https://github.com/Wynntils/Wynntils/issues/488
• https://github.com/Wynntils/Wynntils/commit/cf2ba8e38f9b79877432a66964be1d4ccad99f11 fixes https://github.com/Wynntils/Wynntils/issues/487
• https://github.com/Wynntils/Wynntils/commit/c0a493008ae873a6a76a59615351282842849dbe fixes https://github.com/Wynntils/Wynntils/issues/491
• https://github.com/Wynntils/Wynntils/commit/96e3b752a472bf63faa9ed97104b540b185424a4 fixes https://github.com/Wynntils/Wynntils/issues/492
• https://github.com/Wynntils/Wynntils/commit/6d28f5542976c1ee1327b1d8524389b19453a20a fixes https://github.com/Wynntils/Wynntils/issues/493
• https://github.com/Wynntils/Wynntils/commit/476808451bc606c3827dfa8ad946a0b77f2554bb fixes https://github.com/Wynntils/Wynntils/issues/494
• https://github.com/Wynntils/Wynntils/commit/37c8f6b9c7bc4acd83e91f14a65249147f96aa37 fixes https://github.com/Wynntils/Wynntils/issues/496
• https://github.com/Wynntils/Wynntils/commit/45e3f1ac9c9e8bbc067149ce7f280c1e54757432 fixes https://github.com/Wynntils/Wynntils/issues/497
• https://github.com/Wynntils/Wynntils/commit/18442637a6d534143564cfbe157b461ce2929cfc fixes https://github.com/Wynntils/Wynntils/issues/498
• https://github.com/Wynntils/Wynntils/commit/1741c0ee0b2868217ece75d83630de312f5bbf9e fixes https://github.com/Wynntils/Wynntils/issues/499
• https://github.com/Wynntils/Wynntils/commit/3fd18d05d6442767b49c3dc3a2e86021481f9055 (this fix does not have an issue on GH)
• https://github.com/Wynntils/Wynntils/commit/c1ec83151e88960a761ecac8826450726fc6c743, https://github.com/Wynntils/Wynntils/pull/502/commits/ad7695457f20002bbdec0979d6f5c614faa5ba2e fixes https://github.com/Wynntils/Wynntils/issues/500
• https://github.com/Wynntils/Wynntils/commit/81d760b4166114e5df406acbd90c752c77acfabf fixes https://github.com/Wynntils/Wynntils/issues/501
• https://github.com/Wynntils/Wynntils/commit/cf0407b443dcd4f9048fd2bef501e3bbf669358e fixes https://github.com/Wynntils/Wynntils/issues/489