fixed: deleting objects would trigger a crash

more minor changes

style corrections

i'm dumb

also removed the if() case mentioned in the prior commit from addObjectDialog.cpp. :P

enclosed the assert replacement in braces. In release mode, the assert is replaced with nothing and there's a little bit of code in addObjectDialog which uses it as a statement in an one-line if(). With the assert disappearing in release builds this triggered a GCC warning, as the if would be left without a body.

- migrated selection from ForgeWindow to individual LDFiles. Should've done this long ago.

changeProperty(): don't change the property if the value would not change, this should save some procecssing..

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