remove largely unused l3build.tex commands

(unused?)

\ADDRESS
\STYLE
\STYLEOPTIONS
\CLASS
\PACKAGE
\FONTSELECTION

git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@4996 de43f980-851b-0410-b2f7-c40aca1f87e0
fix \TYPE in plain

git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@4997 de43f980-851b-0410-b2f7-c40aca1f87e0
don't assume makeatletter for user commands

git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@4998 de43f980-851b-0410-b2f7-c40aca1f87e0
another 2e command and an update to the \START message

git-svn-id: http://www.latex-project.org/svnroot/experimental/trunk@4999 de43f980-851b-0410-b2f7-c40aca1f87e0