Remove __declspec() properties, for gcc compatibility.

[daliborfox]

This pull request removes the __declspec(property()) fields from the classes in OpenTS, which is a necessary step towards enabling gcc build support.

An alternative would be to introduce a Property class which would contain operator overloading for the value retrieval and assignment on itself to the appropriate getter/setter functions.

[github-actions]

Development builds of 16e384d:

• opents-Win32-Release-2056850
• opents-x64-Release-2056850
• opents-x64-Debug-2056850
• opents-Win32-Debug-2056850

The links work without a GitHub account. Artifacts expire after 90 days, and this comment follows the latest successful build.

[daliborfox]

I had accidentally messed up the line endings in the combuf.cpp file, it should be good now.

I tried to make the changes in the safest way possible, where I've indidivually went through the __declspec(property()) properties, commented one of them out, examined the error log, and then replaced the accesses where applicable with the getter()/setter() until it compiled clean, after which I've moved onto the next property.

The game appears to run correctly, I haven't observed any significant glitches while playing through 2 missions.

I recommend putting on a podcast while reviewing the changes :) There's a lot of them, but they're quite mechanical / monotonous.