Update CMake scripts.

Hi.

A lot of reworing/cleanning of CMakeLists.txt. Plus some updates (internationalisation).

Lowercase the cmake commands (WARNING : lot of changes in CMakeLists.txt -> diff will be hardly readable).
Add targets for lint, doc and pot (if programs are available).
Add internationalisation support (WARNING change the source layout of editors/inkscape/sozi/lang).
Now support yuicompressor, juicer, uglifyjs, sed and cat as minifiers.
Autogen js dependancies in the minify script.
Fix inkscape install layout.

Regards.