Allegro full changelog

Input:
Rename al_get_haptic_active to al_is_haptic_active for consistency.
Rename al_get_num_haptic_effects to al_get_max_haptic_effects.
Implement the missing al_is_touch_input_haptic function.
Move the loops parameter of al_upload_and_play_haptic_effect after the id to be consistent with al_play_haptic_effect.

OSX port:
Fix mouse warping in OSX.
Add retina display support to OSX.

Windows port:
Fix querying display modes before creating a display.
Make the Windows joystick implementation more fault tolerant.
Initialize display callbacks when creating faux fullscreen (Edgar Reynaldo).

Build system:
Fix the conditional compilation of sal.h (Edgar Reynaldo).
Don't look at WinSDK when we're not on MSVC, fixing MinGW builds when MSVC is installed as well.
Fix the static FLAC compile tests on Android and Windows.
Make the OSX frameworks install in the proper location again.

* Added al_horizontal_shear_transform, al_vertical_shear_transform (Jeff Bernard).
* Make al_destroy_bitmap maintain the current display when untargeting the bitmap to be destroyed.
* Delete al_create_custom_bitmap.
* Delete al_ortho_transform compatibility macro.
* Make al_get_d3d_texture_size fail instead of crash if passed a non-D3D bitmap.
* Make al_get_opengl_texture_size return success code to match D3D.
* Rename al_d3d_set_release/restore_callback to be consistent with existing naming, and pass the display as an argument.
* Check availability of fullscreen button on window frame at run-time (OS X).

Core:

* Add userdata to Windows window callbacks and rename the functions (Matthew Leverton).
* Fix ALLEGRO_STATIC_ASSERT collisions from different files included in the same translation unit. Reported by tobing.
* Make al_ustr_empty_string const correct.
* Fix many memory leak/warnings on MacOS X (Pär Arvidsson).

Filesystem:
* Make stdio al_fopen implementation set proper errno on failure.
* Make al_get_standard_path(ALLEGRO_TEMP_PATH) treat environment values as directory names even without a trailing slash on Unix.
* Fix typo preventing get_executable_name from using System V procfs correctly. Reported by Max Savenkov.

Displays:

* Fixed bug on Windows where two SWITCH_IN events were fired when window was minimized/restored (Michael Swiger).
* Fixed inverted al_toggle_display_flag(ALLEGRO_NOFRAME) logic under Windows as well as a bug where repeatedly setting the flag to on would ma