4529: Extend DDNet-Server-Launcher, support DDNet-Server from client in dmg (fixes#4441) r=heinrich5991 a=def-
The old version would just open the file opener immediately which was quite confusing for new users.
Also removed sqlite3 for mac and mysql entirely since they are not needed.
## Checklist
- [x] Tested the change ingame
- [x] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test if it works standalone, system.c especially
- [ ] Considered possible null pointers and out of bounds array indexing
- [ ] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)
4530: Create custom look for DMG using dmgbuild (fixes#4442) r=heinrich5991 a=def-
This removes cross-building DMG support since dmgbuild requires hdiutil, which is macOS only. Thoughts?
Nice background image by Ravie:
<img width="752" alt="Screenshot 2021-12-27 at 00 29 43" src="https://user-images.githubusercontent.com/2335377/147422479-fb278e53-5017-4176-81e8-7cb2e6c83da4.png">
Co-authored-by: def <dennis@felsin9.de>
4528: Try to fix SDL2 assertion failure (fixes#4434) r=heinrich5991 a=def-
I can't really reproduce it:
Assertion failure at SDL_GetWindowFlags_REAL (/home/deen/isos/ddnet/debian6/root/mac64/SDL2-2.0.16/src/video/SDL_video.c:1905), triggered 1 time:
'window && window->magic == &_this->window_magic'
<!-- What is the motivation for the changes of this pull request -->
## Checklist
- [ ] Tested the change ingame
- [ ] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test if it works standalone, system.c especially
- [ ] Considered possible null pointers and out of bounds array indexing
- [ ] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)
4535: Explicitly disable notch area for fullscreen on macOS (fixes#4533) r=heinrich5991 a=def-
See https://developer.apple.com/documentation/bundleresources/information_property_list/nsprefersdisplaysafeareacompatibilitymode?language=objc
<!-- What is the motivation for the changes of this pull request -->
## Checklist
- [ ] Tested the change ingame
- [ ] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test if it works standalone, system.c especially
- [ ] Considered possible null pointers and out of bounds array indexing
- [ ] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)
4538: Add new icons by Ravie r=heinrich5991 a=def-
<img width="752" alt="Screenshot 2021-12-27 at 23 25 59" src="https://user-images.githubusercontent.com/2335377/147511038-9c073c25-8684-4104-96a5-dc1d7ff3e904.png">
## Checklist
- [x] Tested the change ingame
- [x] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test if it works standalone, system.c especially
- [ ] Considered possible null pointers and out of bounds array indexing
- [ ] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)
Co-authored-by: def <dennis@felsin9.de>
