* turn a one-statement function into an inline (resDoResLoadCallback)
* revive resource loading from file (the function pointer for this was removed in r1394, to actually use this pointer new code had to be written)
* modify resDataInit to handle memory allocation as well as data initialization
* modify struct RES_DATA to not have a fixed size char array to contain the filename (is now dynamically allocated together with the rest of the struct, see resDataInit)
* modify some argument lists to take `const char*` instead of `char*`
* change resLoadFile to use RES_TYPE.fileLoad if available, also remove an unused if statement (well actually the condition could never be false)
* resource type "WAV" (see data.c) now directly loads from a file (rather than copying the file entirely into memory and then to operate on that)
* fix sound_ConstructTrack (track.c) where I used the wrong source to copy the filename from
* fix sound_LoadTrackFromBuffer (track.c) to *not* add the track to the tracklist because this breaks other code
* modify sound_ReleaseTrack (track.c) to gracefully deal with NULL pointers
* remove dataAudioRelease (data.c) and instead just use sound_ReleaseTrack
git-svn-id: svn+ssh://svn.gna.org/svn/warzone/trunk@1397 4a71c877-e1ca-e34f-864e-861f7616d084
99153c743c