What changed in EDuke32, build by build

(ATM broken) support for PNG highpal files; their dimensions must be the same as the TGA ones.

Get the glTexImage3D function pointer from the ICD, not from dlsym/GetProcAddress. This fixes OpenGL on Windows since opengl32.dll only has version 1.1 symbols.

Split MD3 model post-processing into common and Polymer parts and defer the latter if the game is started with a different renderer. This has the benefit of faster startup times and much less memory consumption in that case. When the user switches to Polymer later in-game, all processing is done in one run. I've observed crashes due to the music system if it takes too long, so the it may be unreliable. Also some calloc->malloc where the clearing is unnecessary.

Fix the build for everything else; it looks like the macro definition for

fix r1740 msvc build breakage

Atrributify various function declarations. Right now the attributes used are noreturn, nonnull and format, the latter allowing us to catch silly printf errors. Again, these range from relatively benign to disastrous.

Revert the four Makefiles to have a base version in case I screw up again...

Fixes former crash in drawline16 and swaps drawpixel with the unsafe variant there; fixes potential sector[-1] access in sliding Star Trek doors; make CC overridable in Makefiles so that other toolchains or static analyzers like scan-build/clang can be used; with its help, fix some issues, some more severe than others.

This commit doesn't add anything interesting for anyone not interested in tracing down completely absurd bugs.

Fix digitalnumberz spacing and saving/loading of screen size

A week worth of Mapster hacking: first, there is an experimental side view mode toggled with [F3]. Nav keys are {QWAZ}, MMB and RMB. Use with care because it is still in construction. The sector selection routines have been rewritten -- it is now possible to paste the selection into a room and a new inner loop will be added automatically (MickyC's idea). Adds m32script commands drawline16z and drawcircle16z.

Set union ['] and difference [;] for sector selection in Mapster32; probably fix for crash on clipshape-init; replace tabs in doc/build*.txt with three spaces.

a.m32 corruption checker: also handle out-of-range picnum

Works around a bug with newer NVIDIA GL drivers where creating a GL context

New sprite clipping for hitscan; crude debugging code for tracing down the crash that Commander is getting and I can reproduce only in real Windows with the synthesis build.

Sector-like sprite clipping. Check samples/spriteclip.txt.

Don't reset extra tags before loading map in Mapster32.

Pull in backtrace.c (pre-compiled as backtrace.dll and MinGW dependencies) from http://code.google.com/p/backtrace-mingw. When running debugging snapshots, this will print out a helpful backtrace in eduke32.crashlog. I had to disable stack protectors for debug builds as this was pulling in a dependency that I assume most people won't have. If anyone feels like merging that code into EDuke32 itself and find a way to remove the ugly libintl dependencies, be my guest. In the meantime, sorry for the awful commit.

New aspect determination code for classic/Polymost, controlled with r_usenewaspect and r_screenaspect cvars; print stack traces with SDL/GCC; change signature of app_main in game.c to match declarations found in other places and return different positive values on init error.

make sector keep old firstwall when adding inner loop, rewrite setfirstwall to use malloc'ed memory for temp storage instead of end of sector[], reintroduce correct searchwall determination in Polymer mouse picker (intersection of xy projection of aiming ray with wall); added commands to m32script: shiftvarvar[lr], ifhighlighted, ifin3dmode, updatehighlight, sethighlight; coded prototype terrain helper based on isolines and triangle strips.

New CON commands:

mapster32 fixes: aiming crash in polymer, more accurate aiming in polymost + calibration/replacement crosshair via "r_preview_mouseaim", 2 other crashes; fix "S" in tile selector, make read-only variable overridable with "script_expertmode", misc. beautifying.

Re-tie initial SDL mouse grabbing to DEBUGGINGAIDS.

Correctly (I hope) handle the zoom argument of rotatesprite when drawing HUD models in Polymer.

Add a few debug cvars for development purposes.

Fix wrong interpretation of SPREXT_NOTMD that would cause it to assume the flag was set whenever any flag was set, causing the models to switch on and off in Duke Plus with Polymer.