Cosa è cambiato in EDuke32, build per build

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.

Highpalookup maps implementation on the renderer side. Currently set to a hardcoded highpalookup of 6:6:6->RGB and causes a noticeable quality drop. Use the debug1 cvar to toggle ingame.

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.

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.

More sensible dragging in side view mode. When pasting walls in 3D mode, match the actual pixel width of the source wall.

Adds chselshade (change selected shade) to a.m32

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

Fixes quite a few nasty bugs with the new clipping code, including the crash. Clip shapes are now loaded from _clipshape0.map through _clipshape9.map (no break like when loading tiles, just see if each is present). Mapster32: insert some safety code for sprites with sectnum<0. Because this is still a bad thing, have the m32script corruption checker catch this and run it periodically from EVENT_DRAW2DSCREEN. Also draw such sprites in 2D mode with a blood-red color, and make them draggable. Remove set[sector,wall,sprite] commands.

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.

Temporarily replace drawpixels by a bounds-checked version in engine.c.

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

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.

New CON command 'clipmovenoslide', doing the same as clipmove but stopping at collisions before sliding calculations. Fixes a problem with Mapster32 where names.h was tried to be read before setting up the search path.

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.

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