#155 Enable virtual whitespace only during rectangle select

[Josh @ Dreamland]

This feature's pretty common throughout other Scintilla editors (for instance, Geany). Adding this feature's really simple, actually; the hard part is the GUI tweak.

/src/sdk/cbeditor.cpp:1513 checks the option /selection/use_vspace; if it's set, it uses SCVS_RECTANGULARSELECTION | SCVS_USERACCESSIBLE for the virtual space selection mode. Otherwise, it uses wxSCI_SCVS_NONE. Honestly, I'd be happy if it just always used SCVS_RECTANGULARSELECTION, but I'm sure someone out there has some strange psychological dependency on the current behavior. So I'd request either a radio button or just another checkbox to offer better control over those flags.

I would add this myself, but I can't seem to get Code::Blocks bootstrapped locally. To speed this along and avoid seeming lazy, I've created a "best guess" patch which might not build. If someone's willing to test that patch for me, it's here:
http://pastebin.com/Zcn5yBLD

Much appreciated!

[Morten MacFly]

I will have a look. Thanks for the contribution!

[Josh @ Dreamland]

Awesome. Thanks!