Big commit to change scripts

This commit removes many scripts which were previously packaged with
Textual. They are now bundled part of the installer available on
codeux.com.

Scripts that are no longer bundled with Textual:

banhammer
ffuu
flip
o_o
reverse
sealion
shell
slap
spam

This commit also includes an updated version of TXURLDumper to fix a
crash that would occur when closing Textual.

This commit also removes the commands "loadavg" and "sfont" from the
System Profiler extension.
Do not include reserved names in -supportedAppleScriptCommands