Added Concepts mdpi_hdpi_xhdpi

Added 2 icon concepts for the BAM Modders Graphic Menu

Concept #1 brush
mdpi - Holo (blue) - Default (white)
hdpi  - Holo (blue) - Default (white)
xhdpi - Holo (blue) - Default (white)

Concept #2 paintpallet
mdpi - Holo (blue) - Default (white)
hdpi  - Holo (blue) - Default (white)
xhdpi - Holo (blue) - Default (white)