Check if datafile data cannot be read entirely (according to the data size specified in the header) and check for decompression errors. In case of errors, let `GetData` return `nullptr` and `GetDataSize` return `0` for the respective index.
Internally the decompressed size is set to `-1` for data which failed to load, so loading of those data will not be attempted again because it would only fail again and can cause additional log messages.
Rectangles with inverted round corners (`IGraphics::CORNER_I*`) are currently not used anywhere and also only supported when using `Draw4`.
They also feel clunky to use due to the inverted corners being drawn outside of the specified rectangle area.
Use icons for all server settings buttons. Rearrange and group buttons.
Show buttons in disabled state when they are not useable instead of hiding them.
Remove checker background from server settings list.
Overhaul hotkeys, also show hotkeys in the tooltips:
- Enter: add command
- Alt+Enter: update command (previously M)
- Alt+Up/Down: move command up/down (previously no hotkey)
- Delete: delete command
Don't activate command lineinput when selecting, moving or deleting elements, as this prevents the listbox from accepting the delete hotkey.
Fix server settings listbox being active while file dialog is open.
Ensure extra editor dragbar area matches the respective toolbar size.
Remove spacing on the left side of extra editors to improve alignment.
Increase status bar button sizes and make them consistent.
Use `enum` to track active extra editor instead of using multiple `bool`s.
Disable extra editor buttons when tile picker is shown, as the extra editors are not rendered in this case.
So that buttons in the status bar cannot be used while a popup or the file dialog is open.
The tooltip still has to be rendered after popup menus, as popup menus can set the tooltip, which would otherwise not be shown.
Port the `CJsonWriter` utility class from upstream, which makes outputting correct JSON easier.
Add `CJsonWriter` as an abstract class that can write to different outputs. Two implementations `CJsonFileWriter` (writes to a file) and `CJsonStringWriter` (writes to an `std::string`) are added. Upstream `CJsonWriter` can only write to files.
The same tests are added for both implementations. Duplicate code is avoided by using typed tests with two separate test fixtures.
Typed tests have test names like "TestName/0" and "TestName/1", which would result in invalid filenames. Replace the string after the first slash with the name of the typed test and use hyphen instead of slash.
Spam like the following is now hidden by the default config file:
```
[2022-06-16 01:55:22][console]: moderator access for 'left' is now enabled
[2022-06-16 01:55:22][console]: helper access for 'left' is now enabled
[2022-06-16 01:55:22][console]: user access for 'left' is now disabled
```
Also, the following were already converted to debug messages by #5904.
```
[2022-06-16 01:57:05][datafile]: loading data index=88 size=6159 uncompressed=875088
[2022-06-16 01:57:05][datafile]: loading data index=89 size=1481 uncompressed=972400
[2022-06-16 01:57:05][datafile]: loading data index=90 size=7199 uncompressed=972400
```
`stdout_output_level` for printing to stdout, `console_output_level` for
printing to local console and remote console and `loglevel` for the log
file.
Keep the old log level filters 0 for info and more severe, 1 for debug
and more severe and 2 for trace and more severe, introducing -1 for
warn, and -2 for error. -3 will show no log messages at all.
ChillerDragon