Initial support for run-time round type definitions.

The flashbangs idea has been moved into a separate plugin now.
Remove some commented out bits.
Natives and readme cleanup.
Add native for current round type in an arena.
Native and include cleanup.
Fix a bug where the preference menu would not show up.
Fix a round type check in a native.
Merge pull request #58 from splewis/dynamic-round-types

Add support for run-time round type definitions.