Improve Text Format

[Zailer43]

Add options to Text Format such as:

• [x] Interleaved color: Receives a list of colors as input and returns the text with the colors interleaved in the order it received it
• [x] Simple color: Simply adds a color

Also improve the GUI by allowing you to:

• [ ] Make compound text, which allows you to combine several generated texts so that many styles are in the same text, also allow you to remove a part of the text
• [ ] Retrieve a previous text, this goes hand in hand with the previous option, by clicking on a part of the text it places the GUI configuration as it was in that part of the text
• [x] In Two Colors add the possibility to put more colors and rename the tab to Gradients