Previous implementation did not use monospace font on Linux. According to a note
from @wavexx in ba7f39a: "wxSYS_ANSI_FIXED_FONT use the same as DEFAULT in wxGtk".
This commit uses the same workaround by actually loading the font from GUI_App.
1) The macro-processor sanitizes the source code line for invalid UTF-8
characters. Ideally these invalid characters would be replaced with ?,
they are just dropped as of now. Better than showing an empty string
when converting to wxString though.
2) G-code export collects full error message for 1st occurence of an error
for each custom G-code block.
3) The composite error message now displays the errors collected in 2).
4) The error window is now scaled bigger and the Slicer logo is smaller
if the text is to be rendered with monospaced font, as the monospaced
text will not be word wrapped.
Errors in the file output templates are reported in mono-spaced font,
so that the arrow character ^ is displayed at the right column
pointing to the offending spot.
which now will be used for preset choosers on sidebar a preset tabs.
+ for BitmapCache class added m_scale used for correct scaling of SVG images on Retina displays
+ some code clearing from unused functions or function's parameters
+ Added a calculation of a empty bitmaps inside presets in respect to em_unit (to avoid assert)
+ Added scaling for PrintHostDialogs and MsgDialog
+ some code refactoring
Removed libslic3r from the default include paths for all modules but
libslic3r. Now headers from libslic3r need to be included with an
explicit path (libslic3r/libslic3r.h etc)
Split the localization macros into I18N.{cpp,h}
