Change the License for LFyre to the Apache License Version 2.0.

This will have some important effects on the project:
 * All libraries can be linked, statically or dynamically, without
   restriction.
 * Logos, icons, and trademarks of The LFyre Project cannot
   be used inappropriately.
 * LFyre users will not be restricted nearly as much.

This commit changes all of the relevant README's as well as deleting now
unnecessary license files.
Minor tweak to lib folder README.