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fails then the entire build is broken

audio: add support for 'samples' and 'seconds' to source:tell

Update libretro-common

This was supposed to get added along with it being added to source:seek, but I forgot. >_<

* Replace rpng with stb_image for image loading

This is still a work in progres. We need to convert the image format to ensure images display correctly

* Flip the bits

* Add STBI_NO_THREAD_LOCALS

The overhead of fseek internally is unchecked and non-trivial.

* msvc: forcedincludes added to fix/workaround MSC specific issues

 - printf interception allows redirecting printf() into the windows debugger "OutputDebugStringA" function.
 - forcedincludes allow doing this in a way that does not require any changes to the regular codebase or macro obfuscation for non-windows developers.

* vcxproj: add MSC_SOURCES_H to the makefile to improve MSVC IDE search results.

* vcxproj: add makefile-generated lutro_sources.props

We can use CI steps to guard against errant human-modification of this file in the future, if warranted.

Cleanup fprintf(stderr) usage, remove a lot of spurious fflush calls

Fix a few unused variable notices

Disable PhysFS by default

I plan to use a forcedinclude on msvc to fix its bad printf behavior in a way that is non-intrusive for all other platforms.

The bug would cause the seek position to become out of date form the file position and trigger an assertion. Note that audio playback was correct if the assertion was disabled.

Add lutro.window.showMessageBox

- Two input source files cannot both have the same name (lutro window.c,
vorbis window.c) - therefore rename lutro window.c to lutro_window.c
- VORBIS_SOURCES_C was not being added to LOCAL_SRC_FILES for Android

* audio: Overhauled. New Mixer, new decoders, and added proper support for soundData as a static source.

 - avoids cutting sounds before they finish playing
 - cleans up memory for sources
 - even closes file handles!!

* Rename ogg vorbis decoder functions to decOgg_* to match with decWav_ API

* audio: fix WAVE audio corruption at end of sample

Main issue is that some RIFF WAV files have additional non-audio chunks at the end of the file, for meta data. We were mixing this into the audio buffer, causing noise.

* Add lutro.filesystem.getDirectoryItems

* Add more tests

* microsoft visual studio projects added, adds 'make vcxproj' to Makefile

Steps to build Lutro on Windows using Visual Studio:
 - make vcxproj  (requires MSYS2 or make installed for Git BASH)
 - load lutro.sln

You can do these in either order, but the project will fail to load without running make.

Rationale:
 - Provides access to Visual Studio debugging symbols and MSVC debugger.
 - (full stop: this alone was worth all this effort for me)

* Make all the primary target, and fix vorbis build
Co-authored-by: Rob Loach <robloach@gmail.com>

* Implement retro_serialize_size

* Implement retro_serialize

* Implement retro_unserialize

* Add example

* Prevent writing random memory to the savestate

* audio: temporary workaround for audio crashing - nullify samples on unexpected __gc

* audio: Fixed compile error

* sound: don't cleanup sndta, only sources in mixer need cleanup on __gc for now.

Fixes audio static when mixing ogg vorbis source audio.