ConstructionSiteView with new GUI engine

[subchannel13]

Rewrite construction site view (panel at the bottom shown current construction project, allocation slider and star policy) to use OpenGL base GUI instead of WinForms.

• [x] Panel subclass
• [x] Site data passing
• [x] Project button
• [x] Image in project button
• [x] Project button click action
• [x] Slider GUI component
• [x] Resource allocation slider
• [x] Resource allocation update action
• [x] Multistate toggle GUI component
• [x] Star policy multistate toggle
• [x] Star policy update action