Eeschema: fix a *very subtle* bug noticeable only in complex hierachies, for multiple parts per package:
sometimes, the modified flag was set for these components just when switching from a sheet to an other sheet.
Pcbnew: fix Bug #1197414 (dragged track segments does not show clearance area)

Removed most of deprecated OpenGL calls. Items used to be drawn in immediate mode now are drawn using vertex arrays.

Added implementation of level of details per layer and item type pairs basis (items on every layer have a possibility to define the minimum VIEW scale to be shown).

Added the 'cached' parameter for VIEW_LAYER. The parameter decides if items drawn on the layer should be cached or drawn in immediate mode.
Removed m_useGroups from VIEW, as now groups are enabled per layer.

Fixed drawing of lines' caps.

Fixed drawing stroked semicircles using OpenGL backend.

This keeps it out of the KiCad mode path, making that leaner and less confusing about
what is supported in KiCad mode.  Within KiCad mode, treat quoted vs. non-quoted tokens
as the two general categories, with non-quoted having sub-categories.  Eliminate  
an unimplemented, unused function declaration in DSNLEXER.
 
Improve the output formatting of THROW_PARSE_ERROR().

in *.kicad_pcb file loading times.

Replace in EDA_TEXT::Draw the parameter EDA_DRAW_PANEL* aPanel  by EDA_RECT* aClipBox, which is the actual parameter used by Draw.
This change make more easy to  use this function when a EDA_DRAW_PANEL canvas is not used to draw texts.
Remove dead code in worksheet.cpp.

* Do not fail to build when wxWidgets is built with either --with-gnomeprint
  or --with-gtkprint are not configured.  Only display warning.
* Move warning code from include/common.h to common/common.cpp so it only
  shows the warning once instead of every source file that includes common.h