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- fix issue where (null) is printed on errors (#87)
 - fix several issues where lua stack was not correctly managed
 - fix a bug in keyboard keystate init
 - optimize some cases of lua stack management
 - Add custom atpanic() handler (we can expand on this later)

* Added new build types: Debug, Tool, and Player.

 Debug is -O0 compiled with all assertions enabled.
 Tool is -O1 compiled with debug assertions disabled entirely.
 Player is -O3 compiled with tool assertions disabled, and all ignorable assertions demoted to log-only.

Implementation of ignorable asserts is still partial, but as it stands this change is OK to go live (can add features later). On the todo list:
  - add popup to allow content creator to ignore the assert
  - add lua stacktrace information when lua context seems relevant

* GHActions updated to be aware of new player and tool build configs

* makefile: allow changing config from CLI without having to make clean

Also force rebuild of vcxproj target since dep checking is currently insufficient. it should be checking dirs of all globbed source file includes for modifications, but it's not. and this is a really fast step, no point in not running it for now

* Added lutro_errorf and lutro_alertf for logging errors and popup alerts, respectively.

 - Cleans up macros and keeps assertions clearly in the domain of Debug and Tooling builds.
 - removed play_assert and friends, which were both confusing terminology and not practical in design

* audio: remove native pointer dependency on Source

We can't store pointers to lua userdata in C. Lua may move the pointers at any time. So instead we must dereference the lua_ref to obtain the pointer at the point it is used, for example while mixing.

Fixes a problem where the engine can crash after some amount of time, depending wildly on game behaviors and memory usage. In many cases no crash may ever occur. I have a test locally (still WIP) that verifies this problem/fix.

* Added new build types: Debug, Tool, and Player.

 Debug is -O0 compiled with all assertions enabled.
 Tool is -O1 compiled with debug assertions disabled entirely.
 Player is -O3 compiled with tool assertions disabled, and all ignorable assertions demoted to log-only.

Implementation of ignorable asserts is still partial, but as it stands this change is OK to go live (can add features later). On the todo list:
  - add popup to allow content creator to ignore the assert
  - add lua stacktrace information when lua context seems relevant

* GHActions updated to be aware of new player and tool build configs

* makefile: allow changing config from CLI without having to make clean

Also force rebuild of vcxproj target since dep checking is currently insufficient. it should be checking dirs of all globbed source file includes for modifications, but it's not. and this is a really fast step, no point in not running it for now

* Added lutro_errorf and lutro_alertf for logging errors and popup alerts, respectively.

 - Cleans up macros and keeps assertions clearly in the domain of Debug and Tooling builds.
 - removed play_assert and friends, which were both confusing terminology and not practical in design

* 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.

* 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

* Bind retro_reset to love.reset

* Reset audio properly

* Don't reset audio if love.reset doesn't exist

* Pop 3

* Don't hide global var

Fixes a segfault when closing content.

- Fixes #82

This reverts commit d8972128.

- Fixes #67

Notes of skipping custom configuration and initialization don't need to be there.

Rename math.h and math.c into lutro_math.h and lutro_math.c to avoid conflicts with the standard header <math.h>

- Fixes segfault by implementing thread safe audio.
- Makes the audio code a little more valgrind friendly by reusing
  allocated memory in mixer_render()
- Fix a memory/fd leak.