Revert "Release Alicium 2.1"

This reverts commit 7ab023f5db6749e7d1dae9d329dd5d7060ac9e75.

Conflicts:

	Alicium2/Alicium2.csproj
	Alicium2/Extends.cs
	Alicium2/Main.cs
	Alicium2/Main.designer.cs
	Alicium2/Main.resources
	Texts/Alicium2.readfirst.en.txt
	Texts/Alicium2.readfirst.ja.txt