Move about slim into slimcenter

PS2: add manifest
PS3: fix NPE and remove unneeded header
PS4: some cleanup in manifest
PS5: put back caution dialog + Superuser request
PS6: cleanup
PS7: cleanup
PS8: show sizer startup dialog only once
PS9: include call for SlimIRC
PS10: add check for SlimIRC
PS11: fix NPE when checking SlimIRC existance whitespaces clean
PS12: catched two other whitespaces
Change-Id: If97bf21c3fbc5768afa6a15856db26d6208fa533
Merge "Move about slim into slimcenter" into jb4.2