This throw can be trigger by LuaError exception or ConnectionBindFailed exception in the following functions:
* EmergeThread::Thread()
* ScriptApiEnv::environment_Step()
* ScriptApiEnv::player_event()
* ServerThread::Thread()

Fixes #2497.

* TOSERVER_INIT_LEGACY
* TOSERVER_DELETEDBLOCKS
* TOSERVER_GOTBLOCKS
* TOSERVER_REMOVED_SOUNDS
Also use a std::vector instead of std::set for TOSERVER_REMOVED_SOUNDS

* Requested by @Zeno-
* Approved by @nerzhul

* Mods can do setHP function to do damages and override the enable_damage value sometimes

SendPlayerHPOrDie everytime at client connection, damage enabled or not, this will fix the player which stay dead at connection

The bar is only drawn when the user will notice a change, which prevents time overheads that this commit would cause, resulting from useless draws.

Remove max_y from functions, simplify code

* TOSERVER_INIT and TOCLIENT_INIT renamed to _LEGACY
* TOSERVER_PASSWORD merged from dev-0.5, can use protocol v24 and v25
* TOCLIENT_ACCESS_DENIED merged from dev-0.5, can use protocol v24 and v25, with normalized strings an a custom id for custom errors
* new TOSERVER_INIT packet only send MT version, supported compressions, protocols and serialization, this permit to rework everything later without break the _INIT packet
* new TOSERVER_AUTH packet which auth the client
* new TOCLIENT_HELLO packet which send server serialization version atm
* new TOCLIENT_AUTH_ACCEPTED which is send when TOCLIENT_AUTH was okay. After this packet, the client load datas from servers, like after TOCLIENT_INIT_LEGACY packet

* Rename the handlers from _Legacy to regular, because here we can use same handlers
* Fix some packet names and pseudo handlers

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."