Rename some packet and handlers to <packet>_Legacy name for compat layer between new network changes and old network clients

Add Player::isDead function to check player is dead

Previously, tooltips didn't unescape escaped formspec texts.
Item descriptions that trigger tooltips like inside inventories or for item_image_button
don't need to get unescaped, as they don't get set using formspec, but from lua.

Without this, cavegen will use values in the heightmap before they are initialized.

Behaviour on Android remains the same until other alternatives can be devised (if possible)

See #2425 (and the many other -- now closed -- issues reporting this feature as a bug)

Also change bzero to memset. bzero doesn't work on windows

ARMv7 default build
Update curl
Update OpenSSL

Heightmaps: Fix uninitialised values in mgv5/mgv6. findGroundLevel: Return -MAP_GENERATION_LIMIT if surface not found

This caused confusing error messages like "argument #4 to set_node is not a string."

For usages of assert() that are meant to persist in Release builds (when NDEBUG is defined), replace those usages with persistent alternatives

Add schematic decoration force placement flag

* Also change some std::list to std::vector for ClientMap::renderMap
* Remove disabled code in ClientMap::renderMap, disabled since a long time

Server.cpp Use std::list instead of std::vector for playSound, fillMediaCache, sendRequestedMedia, sendMediaAnnouncement and related functions

Server::AsyncRunStep: buffered_messages now uses std::vector instead of std::list. * sendRemoveNode and sendAddNodes are also converted as a side effect