0.32 Alpha bugfixes

An incremental release after 0.31 with a few more bugfixes.

• Various error checks added with more descriptive error messages
• Archvile revives now work properly
• Fixed certain demo desync bugs related to actor lastlook.
• Fixed monsters not waking when in melee range
• Fixed savegames (again)
• Fixed demo recording (again)
• Fixed doom2 credits (again)
• d_main and g_game to asm

After sound effects are bugfixed, an alpha release will be ready.