code cleanup, remove multiline text option in eeschema (multiline text is a work in progress) and minor enhancements

* All: remove all remaining occurrences of g_DialogFont and dialog font menu handers.
* All: remove all remaining non-standard fonts and button text colors from common dialogs.
* PCBNew: remove all non-standard fonts and button text colors from dialogs.
* PCBNew: update project library and path dialog to match changes to CVPCB version.
* EESchema: update project library and path dialog to match changes to CVPCB version.
* EESchema: save vertical/horizontal line direction setting between sessions.

* All - add wxList implementation for dynamic declaration of application settings.
* EESchema: remove non-standard fonts and dialog button text colors from all UI controls.
* EESchema: update project file and application settings from static to dynamic method.
* EESchema: save and restore show hidden pins state between sessions.
* EESchema: global variable reductions.
* EESchema: use EVT_UPDATE_UI instead of SetToolbars() to set control states.
* EESchema: remove unused DialogBlocks BOM dialog project file.
* GerbView: remove non-standard fonts and dialog button text colors from all UI controls.
* GerbView: fix infinite loop when parsing RS274X aperture definitions with whitespace.
* GerbView: add file name to export to PCBNew select layer dialog.

Pcbnew: Fixed: fully broken netlist import from eeschema when using time stamp (fully broken also in stable version).

* Add methods to read and write project file parameters using dynamically defined list.
* Remove all global variables defined in CVPcb code.
* Dynamically define project file settings so class member variables can be used.
* Separate reading and writing application settings from project file settings.
* Make application UI objects and dialogs respect system UI font.
* Remove non-standard widget colors from CVPcb dialogs.
* Changed CVPcb object link list implementation to use wxList.
* Changed project library and path dialog to make OK button save project file instead of confusing "Save Cfg" button.
* Eliminate some duplicate file wildcard and extension definitions.
* The usual code reformatting, commenting, and spelling fixes.

Small change in doc files: footprint_doc moved from help to share/modules
TODO: change dialog_cvpcb_config and copy code (from pcbnew) for multiple user paths in library path list in cvpcb.

Fixed: incorrect refresh of screen area after closing a popup menu (texts and polygons sometimes not redrawn)

Code clarification about 3 confusing functions to display info: DisplayInfo (displaying a message info) and class members DisplayInfo and Display_Infos doing the same thing (see changelog)

* Add default OS program install path(s) to search path list as fail safe.
* Remove unnecessary wxGetApp calls in WinEDA_App class methods.
* Remove non-standard message panel font and changed background to system menu color.
* Remove italic fonts from menus.
* Remove non-standard font in Kicad app project tree.
* Remove font selection dialog menu items from apps for removed fonts.
* Remove all global variables and settings associated with the removed fonts.
* Fixed PCBNew export and import library file dialog response tests from wxCANCEL to wxID_CANCEL.

better handling of libraries paths (removed g_RealLibraryBuffer that had no sense with the new code), mainly in Eeschema
TODO: better handling of user lib paths (more than one path)

Needed with the new code using wxFileName

Needed with the new code using wxFileName