Added Program Settings - various

+Added "LastBinary" & "LastPlugin " program settings to remember last
ones loaded. Used un Emulator, GearDesktop & PluginEditor.
+Added "UseNoTemplate" program setting to enable load plugin editor
empty (old default style).
+Added Resource\PluginTemplate.cs to be used as default plugin template
on generated soluction.
+Added "UpdateEachSteps" program setting to enable changes on the screen
refresh rate.
+Changed tooltips on "open plugin", "load plugin", "open binary" on
GearDesktop & Emulator.
+Changed names on buttons "open plugin", "load plugin", "open binary" on
GearDesktop & Emulator.
+Some interface improvements on LogicView.
+Some DOXYGEN documentation and names correction on PropellerCPU.cs,
CogView.cs, Emulator.cs, GearDesktop.cs.