* Remove push and shove router documentation which is maintained in the
user documentation.
* Remove coding_style_policy.pdf since it is know automatically generated
with the developers documentation and linked on the KiCad website.
* Merge the contents of rules_for_capitalization_in_Kicad_UI.txt into
UIPolicy.txt.
* Remove rules_for_capitalization_in_Kicad_UI.txt.
* Derive the pcbnew copper zone and non-copper zone dialog windows from DIAG_SHIM,
which injects some template code.
* Update UIpolicies.txt to talk about DIALOG_SHIM support.
* Add zone support to eagle_plugin.
* Organize ZONE_CONTAINER class declaration for future privacy and accessors.
* Correct all user strings and comments for the correct capitalization of
application names according to JP. They are KiCad, Pcbnew, CvPcb,
Eeschema, and GerbView.
* Add a note the the user interface policy about the correct capitalization.