Update TODO.txt
Update start.asm: tabs -> spaces
Merge branch 'master' of https://github.com/ExeTwezz/Basic_OS
Update start.asm: tabs -> spaces
Update task.c: remove pushes with no pops; esp -> esp0
Update isrs.asm: (pusha|iret) -> (pusha|iret)d
Forgot to add in 531b679 "Update task.c: remove pushes with no pops; esp -> esp0"
Update timer.c: add a notice
Move disabling interrupts a bit upper