LCD custom displaying features

[Athozus]

Hi,

I have many builds where I would require one of this three :

• [ ] Connectable LCDs : for example, by right-clicking, we should be able to connect with a touching LCD to make one bigger. The borders makes it difficult, and managing text to be correctly displayed from both sides of the borders is very difficult. Related : #66
• [ ] Custom colors : I think right-clicking the LCD could display two slots, one for background dye and the other for text dye. As the text is done by entities (or I'm wrong), afaik it is possible to manually change the color of it. Another solution would be using minetest.colorize, but it doesn't imply a "cost".
• [ ] Custom sizing : Some infos that we display are more important than others, and I would like to write it on two or more lines. As I said above, afaik it is done by entities, so I think we can manually resize them. Maybe we should use a function like digilines.textresize, but I'm not sure. However, it would be much better if the text can be displayed with different sizes. Related : #66