tftp impl and examples with other fixes and refactors

kinda working tftp server

refactor tasks to use vectors for data storage, example updates

list: add support for custom element destructors

Update README.md

Create README.md

update makefile

lists (#2)

rename vector member func

add list from vector constructor

list: fixes and cleanups

refactor thread pool to use list instead of vector for task queue

tftp rough draft

async (#1)

small cleanup

i said only the bare minimum

thread pool implementation

clean up vector, add tests

small vector cleanup

add low level thread stuff

small refactor of async

propagate changes

cleanup, use strings instead of char ptrs

modernize uga_fs

clean up str and tests

add vector implementation

initial commit, migrated and refactored uganet