Add SDL3.pas, four inc-files and a test

tests/testver.pas

@@ -0,0 +1,34 @@
+{
+  This file is part of:
+
+    SDL3 for Pascal
+    (https://github.com/PascalGameDevelopment/SDL3-for-Pascal)
+    SPDX-License-Identifier: Zlib
+}
+
+{ Test is based on testver.c }
+
+program testver;
+
+uses
+  SDL3, SysUtils;
+
+var
+  version: Integer;
+
+begin
+  if SDL_VERSION_ATLEAST(3, 0, 0) then
+    SDL_Log('Compiled with SDL 3.0 or newer')
+  else
+    SDL_Log('Compiled with SDL older than 3.0');
+
+  SDL_Log(PChar(Format('Compiled version: %d.%d.%d (%s)',[
+          SDL_MAJOR_VERSION, SDL_MINOR_VERSION, SDL_MICRO_VERSION,
+          SDL_REVISION])));
+  version := SDL_GetVersion();
+  SDL_Log(PChar(Format('Runtime version: %d.%d.%d (%s)',
+          [SDL_VERSIONNUM_MAJOR(version), SDL_VERSIONNUM_MINOR(version), SDL_VERSIONNUM_MICRO(version),
+          SDL_GetRevision()])));
+  SDL_Quit();
+end.
+