extract icons from raw resource into data dir

[vidma]

• this saves atleast ~9mb of memory, which we consume already a lot...
• this speeds up & simplifies the image loading, and fixes issues with gesture search
  • otherwise the images have to be uncompressed on demand
• we can still store database in assets

tasks:

• unzip
• change msgs
• update paths
• remove unused asset content provider?
• update icons in the zip file
• cleanup the code?

[vidma]

ok for now