Reload browser views only if the appropriate worldspawn keys have changed

Signed-off-by: Kristian Duske <kristian.duske@gmail.com>
Build support for Linux

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

Signed-off-by: Kristian Duske <kristian.duske@gmail.com>
Cache entity model renderers in model manager
Other fixes

Signed-off-by: Kristian Duske <kristian.duske@gmail.com>
Changed rotation handle
Render only modal tool if a modal tool is avtive

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

Signed-off-by: Kristian Duske <kristian.duske@gmail.com>
Rotate tool and feedback rendering

Signed-off-by: Kristian Duske <kristian.duske@gmail.com>
Better rotation feedback rendering

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