android: remove old and unused LOAndroid and LOAndroid2

Change-Id: Ib25c4bb29081ae51a3b06a6fe2af76749ec8ea46
android: support to handle events with prioritization

Low-res tiles should be handleded before normal tiles so for this
add priority to tiles and store in a with priority queue.

Change-Id: I8d36c14503d9b684816d99f577198ac34b729d15
android: tweak low-res tiles

Change-Id: I2806f35ee112b9ea7ccf323e01372f7e2f68ffa2