- Added test cases for findBrushVertex and findBrushEdge functions.
- Include library headers as system headers in Xcode project to suppress some warnings in gtest.

Signed-off-by: Kristian Duske <kristian.duske@gmail.com>
- Added more test cases and methods for brush geometry.

Signed-off-by: Kristian Duske <kristian.duske@gmail.com>