Redraws can be requested way too often than it is required. This commit adds redraw timeout:
- if the view became dirty and there has been no redraw for longer than certain time, it is redrawed immediately
- otherwise, we wait for the next frame

This in general improves smoothness of rendering.

Used in highlighting/routing code.

Removed selection disambiguation in case when there is a choice between a footprint and a smaller component (smaller components have priority).

Changed lifetime of RENDER_SETTINGS (now they are accessible right after PAINTER object is created).

PCB items are refreshed on GAL switching (changes made using default renderer are displayed by GAL).

Added const to GetColor() and GetType() functions in WS_DRAW_ITEM.