Use switch statement for isspace implementation. Results in huge speed increase on Chrome Android at least, avoiding a hot path in common tasks like XML parsing, etc.
added addOnPreRun and addOnPostRun
Updated rename tests
enable permissions checks after initialization
 - convert to new stream API function names
 - convert all indexing into FS.streams to use FS.getStream
Split out createPreloadedFile to FSCOM
initial VFS work
hacked createLazyFile to work with the new FS code