Added rule to autocompile mspsim if needed and show warning if submodule MSPSim has not been initialized
Merge pull request #610 from nfi/mspsim-auto-compile

Autocompile MSPSim and warn if submodule is not initialized.
Extended radio API definitions with support for setting channel, pan id, etc.
Added extended radio API implementation for STM32W
Added stub for extended radio API for CC2420
Added stub for extended radio API for CC2520
Added stub for extended radio API for nullradio
Added stub for extended radio API for rf230
Added stub for extended radio API for cc2430
Added stub for extended radio API for cc2538
Added stub for extended radio API for cc253x
Added stub for extended radio API for mc1322x
Added stub for extended radio API for rl78
Added stub for extended radio API for Cooja
Added stub for extended radio API for seedeye