Add direct link to textual editor.

[tomneutens]

Currently, no direct link exists to the textual editor. Users always see the block editor when loading the page and have to switch manually to the textual editor.

[tomneutens]

The state of the editor can now be saved as a project in the account of the user. This editor state contains the following information:

• blocklyXml: string,
• cppCode: string[{filename: string, cppCode: string}],
• socialRobotXml: string,
• savedAt: Date,
• name: string,
• view: string,
• scenario: string

Based on this information the /savedstates/open route opens the correct view of the editor based on the passed state.