Support for multiple arrays per texture

[Meakk]

Describe your changes

Reduce the number of used texture in the GLES mapper by appending morph targets to the same texture.
This fixes the crash of dota model on Android.

Issue ticket number and link if any

Checklist for finalizing the PR

• I have performed a self-review of my code
• I have added tests for new features and bugfixes
• I have added documentation for new features
• If it is a modifying the libf3d API, I have updated bindings
• If it is a modifying the .github/workflows/versions.json, I have updated docker_timestamp

AI Disclosure

• I have not used AI to generate any of the content of this pull request
• I have used AI to generate code in this pull request:
  • I have carefully read and understood the AI policy.
  • I have carefully reviewed and completely understood every generated line.
  • I disclose below which parts of the code were generated and with which AI model:

...

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[mwestphal]

any specific reason to not do that all the time ?

[Meakk]

any specific reason to not do that all the time ?

Wdym?

[mwestphal]

any specific reason to not do that all the time ?

Wdym?

If this works for GLES, does it work for non-GLES build ?
If so, should we do it all the time ?

[Meakk]

non-GLES builds use vertex attributes, not textures