chore (repo): skip vim swap files
feat (computer): add buttons, open/close, book_manager and book table

Additions in this commit:
	few buttons on right places
	methods to open and close portal with given name of the world
	method to find computer that manages books
	table of books and places in chest
feat (computer): add distiinction between open and close portal command
chore (computer): move open/close rednet to begin/end of program

Move open of rednet network to beginning of program, so it does not open
each time on method call. Same thing with close of rednet network
feat (turtle): add program for turtle portal book manager

Add method to check in to computer screen manager
Add methods to open and close portal with given slot number from chest