feat: add text tile modifier

[jingkaimori]

Add compact, short information about your PR for easier understanding:
Add text modifier for texture file.

• Goal of the PR
  Current implemention can render only one character like this:
  
  Another option is render characters in a string, but this method will render misaligned text because of lacking api.
  
• How does the PR work?
• Does it resolve any reported issue?
  • Text-rendering texture modifier #9946
  • Proper display of text on the surface of a node(box) #1367 partially
• Does this relate to a goal in the roadmap?
  not yet
• If not a bug fix, why is this PR needed? What using cases does it solve?
  Improve fps by render text directly instead of overlay dynamicly

To do

This PR is a Work in Progress.

• Avoid scatter of glyph
• Render paragraph of texts properly

How to test

See games/devtest/mods/testnodes/textures.lua

[tenplus1]

This feature has been needed for some time now. Will it only work for registered nodes or can we edit the texture on the fly for things like signs ?

[jingkaimori]

Will it only work for registered nodes or can we edit the texture on the fly for things like signs

Only works for registered nodes, because this PR adds a tile modifier, and tile can be define only in nodedef.

[rubenwardy]

This doesn't solve #1367 at all, as it's not a proper way of displaying text on a node
I'd much rather see #9999 picked up for that

[sfan5]

Closed since no progress and this is considered the wrong approach as laid out in @rubenwardy's comment.