Store all colors in LdCanvasPrivate and initialize them upon
object creation. This creates a base for color themes.
Make attempts to try adding an object that's not a part
of the document to the selection issue a warning.
This required creating a simple framework for operations to LdCanvas.
It is probable that it's going to require some changes when other
operations are added. The basic idea behind it seems to be good, though.
* Set the working directory for glib-genmarshal correctly.
* Use one more path suffix when searching for glibconfig.h.
* Don't assume that gdk_screen_get_resolution() returns
a useful value.
* Do not require gtk-doc to be installed.
* Use FindPackageHandleStandardArgs in FindGtkDoc.cmake.
* Fix installation (wrong source path).
* Don't install neither the documentation nor the desktop file on Windows.
* Rename ld_canvas_translate_*_coordinates() to ld_canvas_*_to_*_coords().
* Add missing parameter assertions to those functions.
* Rename local variables in draw_grid().
* Use gdk_cairo_rectangle() in expose-event handler.
* Update comments.
This way when the user clicks outside the menu when it is open,
the menu will close itself first.
Keyboard input is however still not handled.
The symbol menu should be redesigned.
* Add missing asserts to exported functions.
* Unify formatting.
* Fix the gtk-doc comment for ld_symbol_category_set_human_name().
* Make ld_library_load() reflect it's declaration.
* Remove an unused variable in ld_library_load_cb().
* Change all char's to gchar's.
* Now diagrams can be created, loaded and saved.
* Define descriptions and accelerators for actions.
* Set irrelevant actions unsensitive.
* Also remove redundant comments for clarity.
