Add support for mount priority #2
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This allows limited manipulation of the search path without unmounting/remounting to get mounts in the right order.
It makes negligible changes to the API, repurposing the existing "appendToPath" parameter to
PHYSFS_mount*and handling typical "flag" values (0, 1, -1) in such a way that current programs should have no change in function. An int is added to eachDirHandleto store the mount's priority for later comparison.I had a use case in mind when I initially wrote this, but the specifics are lost to memory (that was almost 3 years ago). Something that comes to mind is dynamically mounted DLC and UGC: one might mount UGC at a high priority (say 5), so that it overrides DLC at priority 10, which in turn overrides base content at priority 20. If a new DLC package is mounted mid-game, also at priority 10, it won't inadvertently override mounted UGC.