lmu2png: Add wxWidgets GUI

[carstene1ns]

Also, multiple RTP dirs are now supported (like in Player).

[Ghabry]

That is great!

I almost got this to build on Windows for testing :) (wx builds fine with vcpkg, but there is a problem with this ancient SDL_image.cmake file we use, fix in progress)

[carstene1ns]

I have a local branch that replaces SDL with freeimage, not finished yet though.
Made a minimal fork to use on jenkins, but of course compatible with distro packages.

https://github.com/carstene1ns/freeimage-easyrpg

[Ghabry]

Ah okay in that case I can skip the work on fixing cmake :)

[Ghabry]

Saving fails with "no image handler for type 15" defined but rendering works...

Image becomes glitched when resizing the window.

[Ghabry]

To fix PNG saving you must call wxImage::AddHandler(new wxPNGHandler); once, e.g. on startup. Weird this isn't needed on Linux as the doc says only the BMP handler is loaded by default.

Cleanup is not necessary:

A heap-allocated handler object which will be deleted by wxImage if it is removed later by RemoveHandler() or at program shutdown.

[Ghabry]

Jenkins: test this please

[Ghabry]

@carstene1ns this obviously has some conflicts now but freeimage and wx on Windows should be working now :)

[carstene1ns]

Yeah, will adapt this sometime in the next days.

[carstene1ns]

Please test, it works for me™

[Ghabry]

Impressive error message from Windows global namespace pollution. Have to boot Windows to figure this mess out >.>