Remove flagmask field from set_mapgen_params table
Add small bits of needed documentation

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

Add checks for invalid user input for important settings
Rename Settings::tryGet* to Settings::get*NoEx for consistency

This reverts commit 3f376a09.

Rename try* non exceptioning functions to *NoEx

MapgenParams is no longer a polymorphic class, eliminating the need for messy and bug-prone reallocations.
Separation between the common and mapgen-specific parameters is now strongly defined.
Mapgen parameters objects are now properly encapsulated within the proper subsystems.

  -add client states to avoid server sending data to uninitialized clients
  -don't show uninitialized clients to other players
  -propper client disconnect handling
Minor comment fixes in server
Minor bugfixes in connection
  -improved peer id calculation
  -honor NDEBUG flag
  -improved disconnect handling
  -increased initial send window
Remove some dead code