Fix a few memory leaks

- Rewrite zonename_array to use std::map rather than a pointer to an array
of character pointers

- Properly delete ZoneConfig on Zone shutdown

- Delete AdventureTemplates in AdventureManager destructor
Fix exit code values

- Change all exit codes to match the standard of 0 for success
and 1 for error

- Add empty shared folder to utils/defaults for shared_memory
Change binary output path to use CMake variable

Tools that use CMake's EXECUTABLE_OUTPUT_PATH variable to
determine which binary to launch for debugging may be confused
by a relative path, so use CMake variable PROJECT_BINARY_DIR
instead.
Fix some improper uses of printf formats
Reworked RespawnFromHover framework to allow future customization (scripting) of respawn options.
Added event_respawn to be triggered when a client respawns from hover into the current zone (may not be set up correctly!).
one eof newline
Made default-on-error a little less bad.
Fix uses of uninitialized variables

- Replace unknown008 array with two separate variables in Object code

- Fix mismatched safe_delete() of an array
Merge pull request #77 from j883376/cleanups

Various code cleanups
Merge pull request #76 from Zaela/respawn

RespawnFromHover scriptable framework