Prevent player jumping into nodes from below

Fixes camera glitch and cheating at drowning
Fix tooltip and focused item colors.
Merge remote-tracking branch 'minetest/master'

Conflicts:
	src/player.cpp
Falling optimize
Deindent HTTPFetchRequest::HTTPFetchRequest()
Fix compile error in MSVC.
Display images in Windows build. (fixes #33)
Fix m_blocks_added desync
Objects optimize
Use multiple columns in list of players online. (fixes #32)
Add space to client list in server status message to enable word wrapping.
Fix build.
Merge remote-tracking branch 'minetest/master'
Add hacky third person view

only for minetest_game model
Add front view and more

- better collision detection
- view mode is reset when leaving game
- camera bug in liquids fixed
- don't show black screen when players head is in node (3rd person view)
Start with corrupted data
Less lag
Fixed mainmenu lua errors because of changes in get_textlist_index

Fixed lua error when none of the worlds or servers selected are and connect,
delete or configure buttons used.
rare crash
Activate flag passed to lua abm func