This eliminates a hole where spawn was unrelaible, because other scripts
could jump in and steal the RAM. It's not an API break, because 0 used
to be an invalid value.
* Added new positive integer ns validation helper
* `run`, `exec`, and `spawn` verify threads as a positive integer.
* `run` terminal command also fails if the provided threadcount is not a positive integer.
* Removed some references to .script files in various documentation, and removed some of the NS1 example blocks
* Add specific types for sleeve tasks
* Moved LocationName enum to overall enums file
* Add LocationName enum to those provided to player
* remove trailing s on CompanyPosNames enum (now CompanyPosName, in line with LocationName)
* Also regenerated all ns documentation. This leads to an expected error when checking for generated files, because PRs should not normally touch markdown files. Also leads to a lint failure in generated file bitburner.d.ts
* also removed some exporting from NetscriptDefinitions.d.ts for anything that wasn't imported somewhere else.
