adts: add LL_OPT_* defines that enable optimizations (some only make sense if there are tons of files, and need to be able to disable them for thesis). realized this would be perfect application of policy template classes, which will replace this.

fix crashdumps: was failing to write out to file (underlying cause:
current directory no longer being set)
app_hooks: add get_log_dir; used by debug and wdbg_sym

minor improvements/documentation in archive+compression+file_cache+zip

main: remove dead ScEd code

This was SVN commit r3498.

source/main.cpp

@@ -305,8 +305,6 @@ void kill_mainloop()
 }
 
 
-#ifndef SCED
-
 int main(int argc, char* argv[])
 {
 	debug_printf("MAIN &argc=%p &argv=%p\n", &argc, &argv);
@@ -326,18 +324,3 @@ int main(int argc, char* argv[])
 	
 	exit(0);
 }
-
-#else // SCED:
-
-void ScEd_Init()
-{
-	g_Quickstart = true;
-	Init(0, NULL, INIT_HAVE_VMODE|INIT_NO_GUI);
-}
-
-void ScEd_Shutdown()
-{
-	Shutdown();
-}
-
-#endif // SCED