[Icons] Larger types and class members icons
[Icons] Larger project and files icons
[Icons] Invalid reference overlay icon had wrong filename
[Icons] Component & Component Reference Overlay icons
[Icons] New and cleaned folder icons (both open/closed folder icons have the same graphics for now)
* md-closed-folder + md-open-folder
* md-closed-reference-folder + md-open-reference-folder
* md-closed-resource-folder + md-open-resource-folder
* md-solution-folder-closed + md-solution-folder-open
* md-component-folder-closed + md-component-folder-open
[Icons] Component icon (md-component)
[Icons] Cleaned overlay icons, and a new md-component-overlay
[Icons] Fixing incorrectly rebased icons

Signed-off-by: Vaclav Vancura <vaclav@vancura.org>