Style fixes.

Removes RCT2 version string, Infogrames credits and logo, removes strings for aforementioned info.
Moves OpenRCT2 version string to under the Changelog... button, rewords and fixes some of the strings

Label scenery flags, vars and refactor small scenery into cpp file.

Implement 'missing objects' window

Basic implementation of 'bad objects' window

Add new object_load_error.c

Add object_load_error.c

Faffing about

String stuff

Stuff

Get window basically displaying

Proper col header for object

Display object types

Display file name and explanatory message

Probably about time I added myself to the dev list

Cleanup and comments

Make bad object window work with SC6

Fix whitespace, string IDs, flip core function sense

Fix spacing in string_ids.h

Fix string ID snafu

Fix HasNoInvalidObjects() sense

Attempt to refactor this to pass data properly

Move typedefs to separate header

Fix up signatures

Add park_load_result_types.h

Clean up includes and remnants of prev implementation

Split duplication into function, free invalid entries list on close

Use pointer for object_validity_result param

Fixup string IDs

Use LoadObject() directly

Use dependency injection, fix string termination

Xcode fix, make helper function static

Fix buffer overrun and memory leak

Use SDL for clipboard functionality

Fix function & variable declarations

Rework editor_read_s6() to use new park load result type

Update changelog for #5624

[ci skip]

Fix mem leak, function signature and whitespace