added codeblock-values
using new comparison types
using new codeblock-value conversion to display the result
fixed string representation for VT_UNDEFINED
fixed cbvalue assignment
using cbvalues now completely in eval function
updated test-script
misc
implemented strings
implemented string comparison
updated test-script
implemented print-directive
implemented boolean-values
replaced basic types like 'int' by codeblock-alias-types like 'cbnumeric'
fixed comparison of cbstring and cbnumeric to return a cbboolean value
updated test-script
updated test-script