Add (experimental) support for topbottom as well as sidebyside 3d mode

Add DPI support for statbar
Move heart+bubble bar to Lua HUD
Add statbar size (based upon an idea by blue42u)
Add support for customizing breath and statbar

Minor coding style fixes

Add support for (configurable) multiline hotbar
Improved screensize handling
Add userdefined gui scale by BlockMen

Don't use TOSERVER_RECEIVED_MEDIA but TOSERVER_CLIENT_READY as indicatio for client ready
Handle clients with protocol version < 23 (almost) same way as before
Make client tell server about it's version
Add client state to not send bogus player position updates prior init complete
Add access to statistics information (peer connction time,rtt,version)
Fix clients standing stalled in world while preloading item visuals (new clients only)
Add get_player_information to read client specific information from lua

Parallax mapping with slope information.
Overriding normal maps.

Add check for datatype overflows
use native datatype indices instead of fixed 16bit/32bit ones

Use tables for adding particles, deprecate former way.

separate particles(pawner) definition, add default values, work with no
arguments

This doubles performance on some window managers (WTF?!)