Fixes:
* do not strip 'filter' as a directory prefix.
* proper spacing for scaled sheet fonts.
* fix of transparent color in BMF fonts.
* fix restart button on error pane in Windows.
* do not skip over empty 'if's with a condition that would error out.
Mainly this means that it's no longer necessary to reorder the palette to get working translated glyphs, so the FFontChar1 class and the TranslatedPic member and its invasive handling could all be cleaned out.
All font operations now take place on true color data, with the sole execption of FSpecialFont's 'notranslate' handling.
The base palette can be set via .def files so that the engine has no access to it until the entire game state is set up.
This means that font translations and PNG palette remap tables cannot be built when the owning objects are created.
For PNGs this has the added advantage that they only get done when really required and not unconditionally - most of the time the remap table isn't even needed here.
Thid fixes the slider graphics in the option menus.
# Conflicts:
# source/core/gamecontrol.cpp
# Conflicts:
# source/core/gamecontrol.cpp
This pulls in a lot of Doom specific font setup, this can be sorted out later as it won't get into the way.
# Conflicts:
# source/CMakeLists.txt
# Conflicts:
# source/glbackend/hw_draw2d.cpp
# Conflicts:
# source/CMakeLists.txt
# Conflicts:
# source/glbackend/gl_texture.cpp
# Conflicts:
# source/CMakeLists.txt
# Conflicts:
# source/build/src/palette.cpp
# source/core/gamecontrol.cpp
