Add BEL functionality from Michael Schweikert

Added BEL functionality to Propeller-based consoles
Build directory cleanup

Source/Prop/Build.cmd

@@ -0,0 +1,20 @@
+@echo off
+setlocal
+
+set TOOLS=../../Tools
+
+set PATH=%TOOLS%\bst;%PATH%
+
+call :bstc PropIO
+call :bstc PropIO2
+call :bstc ParPortProp
+
+goto :eof
+
+:bstc
+echo.
+echo Building %1...
+bstc Spin\%1 -e -l
+if errorlevel 1 goto :eof
+move /Y %1.eeprom "..\..\Binary"
+goto :eof