Revert "Templatify the maps PHP code"

This reverts commit f543860c29b7f30116ab1f8d6612ecd827471123.
Revert "Add an experimental map template"

This reverts commit 3fc0c3d89d168476d598cb435e7df304cc9b5b00.
Revert "Add h2o submodule"

This reverts commit fbf7773755ccb976ffd69cb667746e40813dc523.