There may be some race conditions with this but i think this is good enough to start with
For some reason this does not work on 32 bit version, so it is disabled on that platform. I'll have to look into it later to find the bug :)
ELFs are now loaded as MemoryRegions so they don't need special handling anywhere. This also allows file backed COW optimizations to work. This was not the case before. This patch removes now obsolete LoadableELF and unused ELF files from LibElf.
