Editmesh: add primitive basics back. Had to clean up a load of
crap there... but it's sorta in control, so I think Shul can
pick it up again.
Test: ctrl+0 adds plane, or ctrl+9 adds grid.
Notes for Shul:
- i've added a transform function, which gets correctly passed
on to the add_prim function, should work for all object
transforms. Only the code inside add_prim might be needed
to check (it uses 4x4 mat now, not a 3x3)
- The old code with buttons has been ifdeffed out, check for
user input and make it rna properties, which get read
in the exec(), and handed over to the add_prim. Set them
default now to the values from old buttons.
- Operator naming is preferred lower case, I gave this
a new name.
- check a bit on formatting code, but don't use the old code
as example! Look also at ED_keymap_mesh() for example.
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