PropellerCPU Documentation & correction of locks

+Some documentation on PropellerCPU.cs, Cog.cs
+Name change for Propeller Class to PropellerCPU (and file).
+Correcction for lock not clear on reset() problem.
Merge branch 'master' of https://github.com/gatuno1/gear-emu into gatuno1-master

Conflicts:
	Gear/EmulationCore/Cog.cs
	Gear/EmulationCore/InstructionDisassembler.cs
	Gear/EmulationCore/PropellerCPU.cs
	Gear/GUI/Emulator.cs
	Gear/PluginSupport/PluginBase.cs
Merge branch 'gatuno1-master'