for backwards compatibility

The regex wasn't properly escaped here which lead to problems when the
path contains backslashes. This is the root cause of the bug reported
at https://github.com/cosmocode/edittable/issues/19

locations corrected, when those values are "url(...)".

Explanation:  In the change to the less css extension, variable
replacements now happen after the less/css files are processed
for correction of relative locations.

This reverts commit 88833bac.
and fixes FS#2874

Fix violations for the following sniff
DokuWiki.Functions.OpeningFunctionBrace

Also removed an extraneous semicolon.

This is another go at what pull request #227 tried to do. This removes
support for a style.local.ini in the template file in preference of a
style.ini in the conf folder

This now gives proper files and line numbers for errors

This makes it possible to safely overwrite ini replacements from within
any less file

still needs testing

This prevents buffering of the cache file output.

This fixes several problems:
- the CSS cache was only updated when either the CSS files for all media
  types or one of the global files was modified
- when only the screen CSS was changed, the screen CSS was regenerated
  but then the cache was printed which either caused duplicated screen
  CSS output when gzip output was disabled or invalid output with gzip
  enabled as first the plain text screen CSS and then the
  gzip-compressed cache file was printed

Now first all CSS files are collected, then the cache is checked once
and only after this the CSS content is collected.

Instead of three stylesheets for 'all', 'screen' and 'print' modes, they are all loaded into a single stylesheet by wrapping all screen styles in a "@media screen {}" and all print styles in a "@media print {}". The 'all' mode is not wrapped in anything.
Potential issues with existing CSS: If any of your screen or print CSS files already contain any "@media" syntax, the CSS will probably break. In that case please add any CSS with "@media" in it to the 'all' mode instead!

Also, the 'rtl' mode is hereby deprecated. Please just prefix any RTL styles within your normal CSS files with "[dir=rtl]". This also fixes that RTL styles cannot be added for 'all' or 'print' modes.