Blender Git Loki

First commit of a new toolbox system.

Aim was to find a simple & easy system, script alike, to add and configure
a toolbox system, so that others can experiment, but also of course Python.

Summary:
- spacebar calls it up. SHIFT+A still does old toolbox
- hold left or rightmouse for 0.4 second, and it pops up as well
this is experimental! Can be tweaked with Userdef var "ThresA"
- it is a little bit complete for Object mode only. Needs still work
at information desing/structure level
- the code works like an engine, interpreting structs like this:

static TBitem addmenu_curve[]= {
{ 0, "Bezier Curve", 0, NULL},
{ 0, "Bezier Circle", 1, NULL},
{ 0, "NURBS Curve", 2, NULL},
{ 0, "NURBS Circle", 3, NULL},
{ 0, "Path", 4, NULL},
{ -1, "", 0, do_info_add_curvemenu}};

- first value is ICON code,
- then name
- return value
- pointer to optional child

last row has -1 to indicate its the last...
plus a callback to event function.

I also built an old toolbox style callback for this:

static TBitem tb_object_select[]= {
{ 0, "Border Select|B", 'b', NULL},
{ 0, "(De)select All|A", 'a', NULL},
{ 0, "Linked...|Shift L", 'L', NULL},
{ 0, "Grouped...|Shift G", 'G', NULL},
{ -1, "", 0, tb_do_hotkey}};

here the return values are put back as hotkeys in mainqueue.

A mainloop can do all context switching, and build menus on the fly.
Meaning, it also allows other designs such as radials...