[BUG #6645] migrating .less to .scss

- flattening namespaced mixins
[BUG #6645] migrating .less to .scss

- reproducing base.css from base.scss (modulo formatting)
[BUG #6645] migrating .less to .scss

- reproducing layout.css from layout.scss (modulo formatting)
[BUG #6645] migrating .less to .scss

- reproducing pages.css from pages.scss (modulo formatting); incomplete
[BUG #6645] migrating .less to .scss

- reproducing pages.css from pages.scss (modulo formatting)
[BUG #6645] migrating .less to .scss

- reproducing reset.css from reset.scss (modulo formatting)

For this migration step, generated .css files were additionally formatted by
hand, to ease diffing. This doesn't have to happen on further generation runs.
[BUG #6645] add build-resources job
[BUG #6645] .css files generated by pyScss

- does translate colors #366ac1 into rgb(21.065%, 41.741%, 75.68%)
  - sometimes!
- does translate linear-gradient(to bottom, <color1>, <color2>) to
  linear-gradient(bottom, <color1> 0%, <color2> 100%)
  - sometimes!
[BUG #6645] add resources-check, renamed jobs to resources-*

- also slight changes to console output
- re-ordered high-level jobs, so docs come last
[BUG #6645] activated .gitignore
[BUG #7287] Problem with qx.Application.Routing with History of CustomData... 


* Fixed routing, when no customData is set on a application-based call of executeGet()
typos
[BUG #6645] pending changes have been incorporated into .scss files
[BUG #6645] updated readme and makefile
minor comment
[BUG #6645] ignore copied files
[BUG #6645] last check-in of copied changes
[BUG #6645] use third-party reset.css verbatim
[BUG #6645] remove reset.scss
Revert "[BUG #7287] Problem with qx.Application.Routing with History of CustomData... "

This reverts commit 8ccc244da3c1e7a0f0987ee41bf70c18bdbcfa5c.