Clarification for "Ignore Class Types", "View Class Types" and other preference

[snowme34]

Should have messages, tooltips, renaming for:

1. Clarify the functionality of "Ignore Class Types"
2. The difference between "Ignore Class Types" and "View Class Types"
3. The fact that the auto generated schedule is just one possible way, more customized way can be created in "Builder" (and especially how "Ignore Class Types" is used for generation but does not take effect for "builder" mode)

[snowme34]

#84