themes MDL-21862 Implements base theme and standard theme.
Very big theme changes, standardold theme has been split into two themes base and standard. Base theme contains only CSS that is absolutly required (e.g. layout, white space rules, specific widths) and standard (which now looks like standardwhite) contains all the frills.
The following noteable changes have also been made:
* Plugin CSS has been pushed back into the plugin directories as styles.css files.
* Install_print_header has been corrected.
* Redundant or deprecated rules have been removed.
* Several minor class changes throughout Moodle.
* CSS is now single line rules not multiline indented.
* Installs with theme=standardold automatically switch to standard.
* body classes / id now have prefixes to make it clearer what they are and avoid conflicts.
Also worth noting:
* There is still alot of tweaking that is required to get everything looking as it is supposed to, please be patient or better yet help out.
* I am currently working on the documentation for the themes system... it will be here soon.
