Remove the Result object in favor of throwing exceptions

[Gerrit0]

As much as I love Rust's Result type, to use it effectively requires that it is always used. If a function returns a Result<T, E>, the caller of said function must use the result of that function. If they fail to do this, then any errors are silently ignored.

TypeDoc's Result type suffers from this problem. A cursory search didn't turn up any simple way to add a lint rule requiring that it be used, so we need to move back to standard exceptions. This was the cause of #1237.

This should be a relatively simple change. Delete result.ts, see what TS yells about, then switch to returning values directly.