Gamepad support on all platforms

[lcodes]

still need to finish other platforms

[lcodes]

Unsure why it sees this as an addition? Got in from a rebase

[monofuel]

testing the gamepad example on linux, i get crazy C errors:

/home/monofuel/.cache/nim/gamepad_d/@z..@ffep@fjvaql@fcyngsbezf@fyvahk@fcyngsbez.nim.c: In function ‘gamepadEvent__OOZfepZjvaqlZcyngsbezfZyvahkZcyngsbez_u143’:
/home/monofuel/.cache/nim/gamepad_d/@z..@ffep@fjvaql@fcyngsbezf@fyvahk@fcyngsbez.nim.c:1498:165: error: passing argument 1 of ‘udev_device_get_devnode’ from incompatible pointer type [-Wincompatible-pointer-types]
 1498 | Projects/Softmax/windy/src/windy/platforms/linux/gamepad.nim");        devnode_1 = udev_device_get_devnode(device_p0);
      |                                                                                                            ^~~~~~~~~
      |                                                                                                            |
      |                                                                                                            tyObject_udev_device__h9c3w7T9cp8IOvodH9c9bJ3e1Q *

In file included from /home/monofuel/.cache/nim/gamepad_d/@z..@ffep@fjvaql@fcyngsbezf@fyvahk@fcyngsbez.nim.c:10:
/nix/store/mfsa7vg8jqfa0480liz5wagpzava1sd3-systemd-minimal-libs-257.7-dev/include/libudev.h:80:57: note: expected ‘struct udev_device *’ but argument is of type ‘tyObject_udev_device__h9c3w7T9cp8IOvodH9c9bJ3e1Q *’
   80 | const char* udev_device_get_devnode(struct udev_device *udev_device);
      |                                     ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
/home/monofuel/.cache/nim/gamepad_d/@z..@ffep@fjvaql@fcyngsbezf@fyvahk@fcyngsbez.nim.c:1514:77: error: passing argument 1 of ‘udev_device_get_syspath’ from incompatible pointer type [-Wincompatible-pointer-types]
 1514 |                 nimln_(40);             syspath_1 = udev_device_get_syspath(device_p0);
      |                                                                             ^~~~~~~~~
      |                                                                             |
      |                                                                             tyObject_udev_device__h9c3w7T9cp8IOvodH9c9bJ3e1Q *
/nix/store/mfsa7vg8jqfa0480liz5wagpzava1sd3-systemd-minimal-libs-257.7-dev/include/libudev.h:77:57: note: expected ‘struct udev_device *’ but argument is of type ‘tyObject_udev_device__h9c3w7T9cp8IOvodH9c9bJ3e1Q *’
   77 | const char* udev_device_get_syspath(struct udev_device *udev_device);
      |                                     ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~
/home/monofuel/.cache/nim/gamepad_d/@z..@ffep@fjvaql@fcyngsbezf@fyvahk@fcyngsbez.nim.c:1548:99: error: passing argument 2 of ‘libevdev_new_from_fd’ from incompatible pointer type [-Wincompatible-pointer-types]
 1548 |                                                                 T26_ = libevdev_new_from_fd(fd_1, &device_2);
      |                                                                                                   ^~~~~~~~~
      |                                                                                                   |
      |                                                                                                   tyObject_libevdev__M1xDZWWb3Zlpwnni0CL4vg **
In file included from /home/monofuel/.cache/nim/gamepad_d/@z..@ffep@fjvaql@fcyngsbezf@fyvahk@fcyngsbez.nim.c:13:
/nix/store/aii3y8mv471svmm4rd41jm4bj0xgddbz-libevdev-1.13.4/include/libevdev-1.0/libevdev/libevdev.h:810:52: note: expected ‘struct libevdev **’ but argument is of type ‘tyObject_libevdev__M1xDZWWb3Zlpwnni0CL4vg **’
  810 | int libevdev_new_from_fd(int fd, struct libevdev **dev);
      |                                  ~~~~~~~~~~~~~~~~~~^~~
compilation terminated due to -fmax-errors=3.
Error: execution of an external compiler program 'gcc -c -w -fmax-errors=3 -pthread   -I/nix/store/i4503l5qxf913s0dh61yf50bg8znzshf-nim-unwrapped-2.2.4/nim/lib -I/mnt/rhotano/home/monofuel/Documents/Projects/Softmax/windy/examples -o /home/monofuel/.cache/nim/gamepad_d/@z..@ffep@fjvaql@fcyngsbezf@fyvahk@fcyngsbez.nim.c.o /home/monofuel/.cache/nim/gamepad_d/@z..@ffep@fjvaql@fcyngsbezf@fyvahk@fcyngsbez.nim.c' failed with exit code: 1

[monofuel]

Suggested change

	if defined(linux):
	if defined(linux) and not defined(emscripten):

we don't want -ludev or -levdev when building emscripten on linux

[monofuel]

gamepads work great on emscripten!

[monofuel]

Update: the snes-style usb gamepad at the office works on the emscripten version. However a ps2-style and an atari-style joystick at the office does not seem to be working, even after reloading.

all 3 of these controllers work fine on an html5 gamepad tester. strange that one would work and the others not