Ensure the base dir is set; minor fixes

First draft of bash version

Add verbose logging and version print option

Ignore everything else in tmp

Link to lastBuild page to more easily get the build date etc.

Fix CIA ID generation and remove sed prerequisite

Add better support for RTPs, better explanation of the process and better error reporting

Add 'release' to the example

Use a single folder to contain all RTPs

Rename info.cfg to gameinfo.cfg since it's more clear

Ensure the RTP directory exists

Add note about out/tmp files

Better documentation, more info on the RTP, and check for RTP availability in the script

Ignore RTP directories

Initial version of build script