Windowed mode command line switch

docs/en/advgame.md

docs/en/getstart.md

docs/hu/advgame.md

docs/hu/getstart.md

platform/allegro/main.c

platform/common.h

platform/glfw_pa/main.c

platform/raylib/main.c

platform/sdl/main.c

platform/sokol/main.c

public/manual_en.html

public/manual_hu.html

tests/converter/advgame.h