Use system clipboard rather than an internal one

apply the c++11 'override' keyword to overriding virtual functions

fixed: history is supposed to be closed by default

further work on primitive cond-lines. I think I got it now.

Renamed the color class to LDColor for clarity

primitive generator: add conditional lines to cylinders; improved bad color handling

Added history functionality for swapping

fixed: double-clicking an object and editing it that way would not register to history

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mercurial