Implement click&drag system from gregoire. but with road not work.
Merge branch 'master' of https://github.com/gecube/opencaesar3 into vs2008-added
Changes from gathanase are added. Construction the road, houses, removal of objects working also when lmb pressed.
Now emigrant find new emptyhouse, if dest house fully.
Merge pull request #17 from dalerank/master

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