Change color of remove icon to red, instead of green
Make lock/unlock icon look less distorted and switch to SVG
Update new selection clearing icons

- Rebuild using GIS theme components
- Make yellow RGB values match other selection icons
Switch icons in custom CRS dialog to be more consistent with rest of app
Switch CRS icon to SVG, simplify it, and update using GIS theme components
Switch custom projection icon to SVG and from 'magic wand' to variation of new CRS icon
Switch QGIS Broswer 'set projection' icon to SVG and from 'magic wand' to variation of new CRS icon

- Make browser toolbar icon size honor app's pref