Cppcheck fixes

Fixes some of the code issues reported by #155

(In hindsight I probably should have based this on master, considering some of them are definitely compiling related ...but I based the branch on next so, there we are)

You can just rebase right?

Yeah, I'll see if I can figure that out tomorrow maybe

added 9 commits

• 879a2bd2 - G_GhostTicker/G_ReadMetalTic: type should default to MT_NULL, not -1
• d11ba672 - G_ReadMetalTic: Make sure all three values for GZT_XYZ are read in the right order
• adb11eec - dehacked.c: use actual size of descriptions buffers rather than MAXLINELEN, which is way too large
• 73404428 - P_XYMovement: initialise slopemom to all zeros
• 8092d303 - Polyobj_rotate and related: change "origin" to vector2_t since all it needs is…
• bb1a2dbb - sdl/i_main.c: fix wrong placement of #endif for LOGMESSAGES code
• 5349a0bf - V_Init: count to NUMSCREENS, not NUMSCREENS+1 (though I can't help thinking this…
• b11d58ae - clean up BUGTRAP code in win32/win_main.c to avoid unmatched }
• cb7423b9 - sdl/i_main.c: while we're here, split all the logging initialisation code into a…

Compare with previous version

changed the description

changed target branch from next to master

There, the branch is now rebased on master.

changed the description

merged

mentioned in commit 982d1db5