State Names should be able to start with UpperCase

Why

There is some confusion about what can be written in uppercase and lowercase, and we only defined that in the Grammar.

During the user study, some participants started writing the state names capitalized (i.e., first letter Upper Case and the remaining in lower case). However, the current grammar does not allow it since capitalization is reserved for Alias.

Maybe it would make sense to allow both types to be capitalized specially since we got different annotation for each that serve as syntax sugar but help desambiguate.

Example

@StateSet({"Uninitialized", "Initialized"})
public class SM1 {

	@StateRefinement(to="Uninitialized(this)")
	public SM1() {}
	

	@StateRefinement(from="Uninitialized(this)", to="Initialized(this)")
	public void initialize() {}
}
...
	public static void main(String[] args) {
		SM1 sm1 = new SM1();
		sm1.initialize(); //Error
	}

The states are capitalized so they are handled as alias which should not be the correct behavior.

Steps

1. Allow in the grammar that states can be capital (confirm if it is needed).
2. When parsing the refinements AST make sure the capitalized states are treated as such and not as alias.
3. Test with examples.

Current Approach

Check if any of the state names provided starts with uppercase - if so, immediately return with an error.

首先定位 grammar 和 refinements AST parser，然後追蹤目前如何將首字母大寫的狀態名稱分類為別名。執行 issue 中描述的範例，並新增或更新涵蓋首字母大寫狀態和別名的測試。完成標準是：有效的首字母大寫狀態名稱能夠解析為狀態，同時不破壞別名處理。