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-ported some of the Object mode select menu to use uiDefMenuButO
- select random/layer still uses the hard coded value as no sutible popup exists
- select by type suffers from random crashes, somthing to do with Context
- need some way of doing sub menu's using the operator's invoke
- the old menu is just #if'ed out
- and did a little hous cleaning aswel
- added some undo pushes to the select operators
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