Scour extension files organization

[jazzynico]

Hello,

The Scour extension currently needs six files to run, and some of them (svg_regex.py svg_transform.py and yocto_css.py) have nothing on their filename that makes you know they are related to scour.
IMHO, the extension would be easier to maintain:
1. if we add a scour_ prefix to each scour file.
2. or if we move all the files except scour.inx and scour.inkscape.py to a scour subdirectory.

Solution 2 may be a bit easier to implement since it just requires modifications in the extension specific files and in the package script, but not in the standalone (common) files.

[su_v (suv-lp)]

Other examples:
- Gcodetools, JessyInk, Eggbot (common prefix)
- Barcode, InkCut (sub-folder)

[jazzynico (jazzynico)]

The new scour maintainer apparently dropped the Inkscape related files. Thus I guess it's up to us to reorganize how the extension is imported in Inkscape.

See Bug #1411149 "Update the built-in Scour Extension to 0.30".

[jazzynico (jazzynico)]

Changes applied to the trunk, rev. 14234.
Please test!