split colorbar functions into shared

There is a lot of useful code that is currently intertwined with GLUT
and GLUI. This splits that code out and put it into shared.

This introduces a new head shared_structures.h to hold some structs
which are used in shared files. This should eventually be factored out.

This does include some refactoring in that colorbar data is collected
into a struct of type `colorbar_collection` which can be used without
reference to global variables (including tests as shown in
`Tests/parse_colorbar.c`).

Author: JakeOShannessy

Build/smokeview/Makefile

@@ -48,7 +48,7 @@ bin = .
 
 csrc = callbacks.c camera.c color2rgb.c readimage.c readgeom.c readobject.c readcad.c colortimebar.c compress.c csphere.c dmalloc.c \
       drawGeometry.c file_util.c getdata.c getdatabounds.c getdatacolors.c glew.c  \
-      histogram.c infoheader.c readlabel.c readtour.c readhvac.c readslice.c readsmoke.c \
+      histogram.c infoheader.c readlabel.c readtour.c readhvac.c readslice.c readsmoke.c colorbars.c colorbar_defs.c \
       IOboundary.c IOgeometry.c IOhvac.c IOiso.c IOobjects.c IOpart.c IOplot2d.c IOplot3d.c \
       IOscript.c IOshooter.c IOslice.c IOsmoke.c IOtour.c IOvolsmoke.c IOwui.c IOzone.c IOframe.o isobox.c \
       main.c md5.c menus.c output.c readsmv.c renderhtml.c renderimage.c scontour2d.c sha1.c \

Source/shared/CMakeLists.txt

@@ -16,6 +16,8 @@ add_library(libsmv STATIC
     stdio_buffer.c
     getdata.c
     color2rgb.c
+    colorbars.c
+    colorbar_defs.c
     readimage.c
     readcad.c
     readgeom.c